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|title= Redefinition and Statistical Analysis of Measures for Evaluating the Quality of Ontologies.
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== Redefinition and Statistical Analysis of Measures for Evaluating the Quality of Ontologies.
==
Redefinition and Statistical Analysis of Measures for Evaluating the Quality of Ontologies Melina Tibaldo1 , Alexia Wilkinson1 , Ma. Laura Taverna1 , Mariela Rico1 , and Ma. Rosa Galli2 1 Centro de Investigación y Desarrollo de Ingenierı́a en Sistemas de Información (CIDISI) - Universidad Tecnológica Nacional - Facultad Regional Santa Fe, Lavaise 610 - S3004EWB - Santa Fe - SF - Argentina mrico@frsf.utn.edu.ar 2 INGAR-UTN-CONICET, Avellaneda 3657, S3002GJC Santa Fe, Argentina Abstract. OntoQualitas is a framework to evaluate an ontology whose purpose is the interchange of information between different contexts. However, the framework does not propose acceptance thresholds of the measure values. In this paper, measures proposed in this framework are redefined in order to improve their usefulness in assessing the quality of such ontologies. These measures were calculated semi-automatically on a set of ontologies and its results were described by means of a statistical analysis as a first step to the definition of their acceptance thresholds. Keywords: ontology quality, measure, statistical analysis 1 Introduction Even after more than a decade since the emergence of ontologies in Computer Science and with its growing use in different disciplines, standardized methods have not been developed for evaluating their quality [8]. Although methodologies, methods, techniques, and software tools to sup- port the ontology building process were proposed, ontology evaluation still plays only a passive role in ontology engineering projects [17]. In order to assess the ontology quality, different works have emerged depending on the kind of ontolo- gies being evaluated and for what purpose [1, 3, 5–7, 9, 15, 20–22]. These works present different quality measures and evaluate some ontologies quantitatively. However, specific studies have not been found about the suitable values of these measures, their acceptance thresholds, and their impact on the quality of the evaluated ontologies. Quality is not a property of something, but a judgment, so that should be in relation to some purpose [6]. While issues such as orphan classes or consistency in naming are important, the purpose for which the ontology is developed should guide the evaluation of quality thus contributing to the enrichment of its quality. The set of measures and their corresponding weights should be in relation with the purpose of the ontology [15]. Proceeding of SAOA 2015 Copyright © 2015 held by the author(s) 51 Redefinition and Statistical Analysis of Measures for Evaluating the Quality of Ontologies A proposed framework to evaluate an ontology considering its specific pur- pose is OntoQualitas, which includes known measures and new measures to evaluate the quality of an ontology whose purpose is the interchange of infor- mation in a collaborative business processes environment [15]. To this aim, a set of requirements is identified that the ontology should fulfill and, associated with them, it is identified a set of questions that reflect specific aspects relevant to the evaluation of ontology. For each question, appropriate measures, their ranges of possible values, and the optimal values are defined. However, the framework does not propose acceptance thresholds of the measure values. In order to advance in the definition of these thresholds and their impact on the ontology quality, the definition of the proposed measures should be analyzed and, if necessary, modified to ensure their homogeneity. Then, it is necessary to calculate the measures on a set of ontologies and conduct a descriptive statistical analysis of the redefined measures in order to study their behavior. This paper presents the reformulation of some of the measures outlined in OntoQualitas, resulting in measures that will be more convenient for evaluation of the ontology quality. In addition, a statistical study of a set of ontologies is shown, to whom the reformulated measures were calculated. The paper is organized as follows: Section 2 describes the main characteristics of the OntoQualitas framework; Section 3 presents the reformulated measures; Section 4 presents the results of the preliminary analysis of data. Results are discussed in Section 5, which also includes the conclusions of this work. 2 OntoQualitas OntoQualitas is a framework to evaluate the quality of an ontology whose pur- pose is the interchange of information between different contexts [15]. It is struc- tured from an overall requirement imposed on ontologies regarding its content and structure, which is that the ontology should allow the interchange of infor- mation between different contexts without imposing a global meaning of such information to all involved contexts. From this overall requirement, three spe- cific requirements are derived: (i) the representation of information interchanged should be formal, (ii) only the information strictly necessary for the interchange must be represented, and (iii) the representation must allow a correct interpre- tation of the interchanged information in all involved contexts. The second requirement aforementioned has two aspects: completeness and conciseness. The third requirement has three aspects: semantic correctness, syn- tactic correctness, and representation correctness, which is assessing the quality of mappings of entities, relations, and features into the elements of the ontology. OntoQualitas specifies questions that help addressing relevant aspects for ontology evaluation. For each question, appropriate measures are associated. Some of them have been proposed with the objective of assessing the quality of ontologies from a quantitative perspective [3, 5, 6, 20, 21]; others were proposed with the aim of evaluating the mapping between domain entities, its relationships and features, and the elements used for its representation [13]. Proceeding of SAOA 2015 Copyright © 2015 held by the author(s) 52 Redefinition and Statistical Analysis of Measures for Evaluating the Quality of Ontologies 3 Analysis of Measures In OntoQualitas, the value of some measures is provided in the range [0, 1], others are provided in the range [0, n], some optimal values are 1, and others are 0. In order to quantify the different quality aspects and to compare values among ontologies, it is necessary to homogenize the value ranges and optimal values of the measures associated with each aspect. As a consequence, a first activity was to modify the definition of some measures to ensure that all have the same scale ([0, 1]) and optimal value (1). Additionally, some measures can only be calculated if the considered ontology has the corresponding characteristics. These situations are explicitly identified in Tables 1 to 5. Completeness (Table 1) refers to the extension, degree, amount or coverage to which the information in a user-independent ontology covers the information of the real world [11]. Concise (Table 2) refers to whether an ontology does not store any unnec- essary or useless definitions, if explicit redundancies do not exist between def- initions, and redundancies cannot be inferred using other definitions and ax- ioms [11]. Syntactic correctness (Table 3) tries to evaluate the quality of the ontology according to the way it is written, i.e. the correctness and breadth of syntax used [5]. Semantic correctness (Table 4) deals with the vocabulary used to represent entities, relations, and features, and the correctness of the representation of the interchanged information in the ontology. Representation correctness (Table 5) is related to the quality of mappings of entities, relations, and features into the elements of the ontology evaluated. 4 Results of Preliminary Analysis of Data The results of this preliminary analysis are presented according to the second and third requirements. Since the considered ontologies are formalized in OWL2, the representation of information interchanged is formal, thus achieving the first requirement. In order to evaluate reformulations to the OntoQualitas measures, ontologies for information interchange between different contexts were needed. A set of ontologies created by students from the course “Development of ontology-based information systems” have been developed from the same specific instructions. First, ontologies (called “base”) were developed by using an ontology learning technique. Then, the representation of entities, their relationships and features were enriched, using a proposed method [14]. These ontologies were called “en- riched”. Measures were calculated semi-automatically and the instructions were the frame of reference. In the base ontologies, certain measures could not be calculated due to lack of the corresponding characteristics. Therefore, in the subsequent statistical anal- ysis, the amount of data varies. Proceeding of SAOA 2015 Copyright © 2015 held by the author(s) 53 Redefinition and Statistical Analysis of Measures for Evaluating the Quality of Ontologies Table 1. Completeness measures Measure Necessary and sufficient conditions [11] N SC = N SLC/LC N SLC: Number of leaf classes with at least one set of necessary and sufficient conditions LC: Number of leaf classes The ontology should have at least a class hierarchy, without considering the root class (Thing) Existential and universal restrictions [11] EU R = EU RP/U RP EU RP : Number of properties with existential and universal restrictions along the same property U RP : Number of properties with universal restrictions The ontology should have at least a property with an universal restriction Domains and ranges of relations [11] DRR = N HRDR/N HR N HRDR: Number of non-hierarchical relations with domain and range specified N HR: Number of non-hierarchical relations The ontology should have at least an object property defined * No omission of subclass partition N OSP = SP D/CSC SP D: Number of subclass-partitions defined on classes with the corresponding disjoint constraint CSC: Number of classes with a set of direct subclasses identified The ontology should have at least a class hierarchy, without considering the root class (Thing) * No omission of exhaustive subclass partition N OESP = CCA/CDSC CCA: Number of classes with a set of disjoint direct subclasses and a covering axiom CDSC: Number of classes with a set of disjoint direct subclasses identified The ontology should have at least a class hierarchy, with a set of disjoint direct subclasses Coverage of classes [12] Coverage(Oc ; Fc ) =| Oc ∩ Fc | / | Fc | Oc : Set of classes in the ontology Fc : Set of classes in a frame of reference The frame of reference should have at least a class Coverage of relations between classes [12] Coverage(Orc ; Frc ) =| Orc ∩ Frc | / | Frc | Orc : Set of relations between classes in the ontology Frc : Set of relations between classes in a frame of reference The frame of reference should have at least a relation between classes Coverage of relations between instances [12] Coverage(Ori ; Fri ) =| Ori ∩ Fri | / | Fri | Ori : Set of relations between instances in the ontology Fri : Set of relations between instances in a frame of reference The frame of reference should have at least a relation between instances Coverage of instances [12] Coverage(Oi ; Fi ) =| Oi ∩ Fi | / | Fi | Oi : Set of instances in the ontology Fi : Set of instances in a frame of reference The frame of reference should have at least an instance Coverage of entity features [15] Coverage(Of c ; Ff c ) =| Of c ∩ Ff c | / | Ff c | Of c : Set of entity features in the ontology Ff c : Set of entity features in a frame of reference The frame of reference should have at least an entity feature Coverage of dimensions [15] Coverage(Odf c ; Fdf c ) =| Odf c ∩ Fdf c | / | Fdf c | Odf c : Set of dimensions used to specify entity contextual features in the ontology Fdf c : Set of dimensions used to specify entity contextual features in a frame of reference The frame of reference should have at least a dimension used to specify entity contextual features * The measure was redefined Proceeding of SAOA 2015 Copyright © 2015 held by the author(s) 54 Redefinition and Statistical Analysis of Measures for Evaluating the Quality of Ontologies Table 2. Conciseness measures Measure * Semantically different classes SDC = 1 − CSD/C CSD: Number of classes with the same formal definition as other class in the ontology C: Number of classes in the ontology, without considering the root class (Thing) The ontology should have at least a class hierarchy, without considering the root class (Thing) * Semantically different instances SDI = 1 − ISD/I ISD: Number of instances with the same formal definition as other instance in the ontology I: Number of instances in the ontology The ontology should have at least an instance * Nonredundant subclass-of relations N RSR = 1 − RSCR/HR RSCR: Number of redundant subclass-of relations in the ontology HR: Number of hierarchical relations The ontology should have at least a hierarchical relation, without considering the root class (Thing) * Other nonredundant relations ON RR = 1 − RN HR/N HR RN HR: Number of redundant non-hierarchical relations in the ontology N HR: Number of non-hierarchical relations The ontology should have at least a non-hierarchical relation * Nonredundant instance-of relations N RIR = 1 − RIOR/IOR RIOR: Number of redundant instance-of relations in the ontology IOR: Number of instance-of relations in the ontology The ontology should have at least an instance-of relation Precision of classes [12] P recision(Oc ; Fc ) =| Oc ∩ Fc | / | Oc | Oc : Set of classes in the ontology Fc : Set of classes in a frame of reference The ontology should have at least a class, without considering the root class (Thing) Precision of relations between classes [12] P recision(Orc ; Frc ) =| Orc ∩ Frc | / | Orc | Orc : Set of relations between classes in the ontology Frc : Set of relations between classes in a frame of reference The ontology should have at least a relation between classes Precision of entity features [12] Coverage(Of c ; Ff c ) =| Of c ∩ Ff c | / | Of c | Of c : Set of entity features in the ontology Ff c : Set of entity features in a frame of reference The ontology should have at least an entity feature Precision of instances [12] P recision(Oi ; Fi ) =| Oi ∩ Fi | / | Oi | Oi : Set of instances in the ontology Fi : Set of instances in a frame of reference The ontology should have at least an instance * The measure was redefined Table 3. Syntactic correctness measures Measure Lawfulness [5] SL = Xb/N S Xb: Total breached syntactical rules N S: Number of statements in the ontology The ontology should have at least a statement Richness [5] R = Z/Y Z: Number of syntactic features used in the ontology Y : Number of syntactic features available in the ontology language The ontology language should have at least a syntactic feature Proceeding of SAOA 2015 Copyright © 2015 held by the author(s) 55 Redefinition and Statistical Analysis of Measures for Evaluating the Quality of Ontologies Table 4. Semantic correctness measures Measure Interpretability [5] IN = SW/W CP SW : Number of words used to define classes and properties that have at least a sense listed in WordNet W CP : Number of different words used to define classes and properties in the ontology The ontology should have at least a class or property name P * Clarity CL = T N/ i Si T N : Total of class or property names in the ontology that have at least a sense listed in WordNet Si : Number of word senses for Ni in WordNet, where Ni is the name of the class or property i The ontology should have at least a class or property name that has at least a sense listed in WordNet * Non-circularity errors at distance 0 N CE0 = 1 − Cycles(O; 0)/HR Cycles(O; 0): Number of cycles detected between a class with itself HR: Number of hierarchical relations, without considering the root class (Thing) The ontology should have at least a hierarchical relation, without considering the root class (Thing) * Non-circularity errors at distance 1 N CE1 = 1 − Cycles(O; 1)/HR Cycles(O; 1): Number of cycles detected between a class and an adjacent class HR: Number of hierarchical relations, without considering the root class (Thing) The ontology should have at least a hierarchical relation, without considering the root class (Thing) * Non-circularity errors at distance d N CEd = 1 − Cycles(O; d)/HR Cycles(O; d): Number of cycles detected between a class and another at d classes away HR: Number of hierarchical relations, without considering the root class (Thing) The ontology should have at least a hierarchical relation, without considering the root class (Thing) * Subclass partition without common instances SP N CI = 1 − SP CI/I SP CI: Number of instances that belong to more than one subclass of a partition in the ontology I: Number of instances in the ontology The ontology should have at least an instance * Subclass partition without common classes SP N CC = 1 − SP CC/C SP CC: Number of classes belonging to more than one subclass of a partition in the ontology C: Number of classes in the ontology, without considering the root class (Thing) The ontology should have at least a class, without considering the root class (Thing) * Exhaustive subclass partition without common instances ESP N CI = 1 − ESP CI/I ESP CI: Number of instances belonging to more than one subclass of an exhaustive partition in the ontology I: Number of instances in the ontology The ontology should have at least an instance * Exhaustive subclass partition without common classes ESP N CC = 1 − ESP CC/C ESP CC: Number of classes belonging to more than one subclass of an exhaustive partition in the ontology C: Number of classes in the ontology, without considering the root class (Thing) The ontology should have at least a class, without considering the root class (Thing) * Exhaustive subclass partition without external instances ESP N EI = 1 − ESP EI/I ESP EI: Number of instances of a base class that do not belong to any class of the exhaustive subclass partition of the base class I: Number of instances in the ontology The ontology should have at least an instance * The measure was redefined Proceeding of SAOA 2015 Copyright © 2015 held by the author(s) 56 Redefinition and Statistical Analysis of Measures for Evaluating the Quality of Ontologies Table 5. Representation correctness measures Measure P Principle of entities [15] PE = k αk /E E: number of entities The ontology should have at least an entity P Principle of intended use of entities [15] PU = k αk /U U : number of intended uses for all entities The ontology should have at least an intended use for an entity P Principle of entity relations [15] PR = k αk /RE RE: number of relations identified for all entities The ontology should have at least a relation between entities P Principle of simple entity features [15] P CS = k αk /CS CS: number of simple entity features identified for all entities The ontology should have at least a simple entity feature P Principle of simple, measurable entity features [15] P CM = k αk /CM CM : number of simple, measurable entity features identified for all entities The ontology should have at least a simple, measurable entity feature P Principle of complex entity features [15] P CC = k αk /CC CC: number of complex entity features identified for all entities The ontology should have at least a complex entity feature P Principle of common entity features [15] P Cc = k αk /Cc Cc: number of common entity features identified for all entities The ontology should have at least a common entity feature αk = 0 if the k element is not represented; αk = 0.5 if the k element is represented in an incomplete form; and αk = 1 if the k element is well represented 4.1 Evaluation of Measures A statistical treatment of the data was performed in order to highlight the most important quality characteristics of ontologies and synthesize them by a few parameters. A total of 39 measures were calculated semi-automatically to a set of 8 ontologies. InfoStat, Student Version3 , was used to do the statistical analysis of this set of measures. Mean lets see the behavior of each measure on the set of ontologies; position measures, the dispersion of data (deviation; Q1, first quartile; and Q3, third quartile). Table 6. Statistical of completeness measures Table 7. Statistical of conciseness measures Variable n Mean S.D. Min Max Q1 Median Q3 Variable n Mean S.D. Min Max Q1 Median Q3 NSC 6 0,17 0,41 0,00 1,00 0,00 0,00 0,00 SDC 6 0,75 0,28 0,39 1,00 0,53 0,78 1,00 EUR 8 0,15 0,35 0,00 1,00 0,00 0,00 0,00 SDI 4 1,00 0,00 1,00 1,00 1,00 1,00 1,00 DRR 8 0,63 0,41 0,00 1,00 0,00 0,82 0,87 NRSR 6 1,00 0,00 1,00 1,00 1,00 1,00 1,00 NOSP 6 0,09 0,13 0,00 0,30 0,00 0,03 0,19 ONRR 7 0,86 0,38 0,00 1,00 1,00 1,00 1,00 NOESP 3 0,50 0,50 0,00 1,00 0,50 NRIR 4 1,00 0,00 1,00 1,00 1,00 1,00 1,00 Coverage(Oc;Fc) 8 0,22 0,07 0,16 0,36 0,16 0,20 0,24 Precision(Oc;Fc) 8 0,33 0,20 0,07 0,57 0,08 0,31 0,50 Coverage(Orc;Frc) 8 0,36 0,23 0,10 0,70 0,10 0,35 0,50 Precision(Orc;Frc) 8 0,16 0,16 0,02 0,38 0,03 0,07 0,33 Coverage(Ofc;Ffc) 8 0,02 0,03 0,00 0,07 0,00 0,01 0,04 Precision(Ofc;Ffc) 8 0,00 0,00 0,00 0,00 0,00 0,00 0,00 Coverage(Odfc;Fdfc) 8 0,93 0,15 0,58 1,00 0,90 1,00 1,00 Precision(Oi;Fi) 4 0,00 0,00 0,00 0,00 0,00 0,00 0,00 3 http://www.infostat.com.ar/ Proceeding of SAOA 2015 Copyright © 2015 held by the author(s) 57 Redefinition and Statistical Analysis of Measures for Evaluating the Quality of Ontologies Regarding completeness (Table 6), only two of the nine measures have a mean greater than 0.6. The measure with the highest mean value is Coverage of dimensions (Coverage(Odf c ; Fdf c )); 90.0% of ontologies have a value greater than or equal to 0.9, meaning that most of the dimensions used to specify en- tity contextual features were made explicit in the ontology. Then, Domains and ranges of relations (DRR) follows with a mean of 0.63, which determines the proportion of domain and range of the relations and functions exactly and pre- cisely delimited. The frame of reference had no instances. Then, the measures Coverage of relations between instances and Coverage of instances, not listed in Table 6, could not be calculated. In regards to conciseness (Table 7), except in Precision, all other measures have high values. Half of ontologies have all of instances semantically different and nonredundant instance-of relations (SDI and N RIR are optimal). The other half has no instances. No ontologies with hierarchical relations have redundant subclass-of relations (N RSR has optimum value in all measures). Semantically different classes (SDC) has a mean of 0.75 and 75% of ontologies have a value greater than or equal to 0.53, meaning that more than half of subclasses are defined with different characteristics. 75% of ontologies do not have redundant non-hierarchical relations (ON RR is optimal). Table 8. Statistical of semantic correctness Table 9. Statistical of syntactic correctness measures measures Variable n Mean S.D. Min Max Q1 Median Q3 Variable n Mean S.D. Min Max Q1 Median Q3 IN 8 0,52 0,28 0,21 0,96 0,31 0,43 0,50 SL 8 1,00 0,00 1,00 1,00 1,00 1,00 1,00 CL 8 0,34 0,14 0,13 0,52 0,15 0,40 0,40 R 8 0,05 0,03 0,01 0,11 0,03 0,03 0,05 NCE0 6 1,00 0,00 1,00 1,00 1,00 1,00 1,00 NCE1 6 1,00 0,00 1,00 1,00 1,00 1,00 1,00 Table 10. Statistical of representation correct- NCEd 6 1,00 0,00 1,00 1,00 1,00 1,00 1,00 ness measures SPNCI 4 0,75 0,50 0,00 1,00 0,00 1,00 1,00 Variable n Mean S.D. Min Max Q1 Median Q3 SPNCC 8 0,96 0,06 0,88 1,00 0,88 1,00 1,00 PE 8 0,10 0,04 0,06 0,17 0,06 0,11 0,13 ESPNCI 4 1,00 0,00 1,00 1,00 1,00 1,00 1,00 PU 8 0,90 0,09 0,80 1,00 0,83 0,88 1,00 ESPNCC 8 1,00 0,00 1,00 1,00 1,00 1,00 1,00 PR 8 0,36 0,23 0,10 0,70 0,10 0,35 0,50 ESPNEI 4 1,00 0,00 1,00 1,00 1,00 1,00 1,00 PCS 4 0,90 0,13 0,75 1,00 0,75 0,92 1,00 PCM 4 0,63 0,48 0,00 1,00 0,00 0,75 1,00 In relation to the semantic correctness (Table 8), the measures are mostly high. The hierarchies are well defined, without cycles (N CE0, N CE1, and N CED), as well as the exhaustive subclass partitions (ESP N CI, ESP N CC, and ESP N EI). By contrast, ontologies are moderately interpretable and un- clear; 75% of them have a value less than or equal to 0.5 and 0.4, respectively. As for syntactic correctness (Table 9), it can be observed that the ontologies are syntactically correct, but the proportion of syntactic features used is very low, despite the development of ontologies supported by a case tool. Finally, as to the representation correctness (Table 10), on average, 90% of the intended use and simple features of entities is represented according to its principle. However, only in 10% of cases, on average, the representation of entities is performed through classes of ontology. The measures Principle of Proceeding of SAOA 2015 Copyright © 2015 held by the author(s) 58 Redefinition and Statistical Analysis of Measures for Evaluating the Quality of Ontologies complex entity features and Principle of common entity features could not be calculated because the ontologies do not have these characteristics. 5 Discussion and Conclusions In this paper, the reformulation of some measures of the OntoQualitas framework has been presented, and the results of a preliminary analysis over the values obtained from applying such measures to a set of ontologies have been shown. According to the results, the evaluated ontologies do not fulfill adequately the second requirement, i.e., the representation of the information strictly necessary for the interchange. In part, this may be due to the ontology learning tool used to generate the base ontologies that do not add necessary and sufficient conditions, or existential and universal restrictions, among others. Looking at the syntactic correctness measures, it can be observed that the richness of language was not seized, despite the use of case tools for the develop- ment of ontologies. The use of ontology learning techniques contributed to this, as only limited to map the elements of the source into the ontology language elements, untapped all syntactic features available. As for the semantic interpretation, measures revealed that the names for the ontology elements (classes, relations, properties) were not properly selected. Regarding the representation correctness, an unexpected result is the low representation of entities through the ontology classes. Finally, these measures allow detecting errors in the development of ontolo- gies, which affects its quality. An exploratory analysis of the data allowed to characterize the studied ontologies. 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