IRIS Università degli Studi di Padovahttps://www.research.unipd.itIl sistema di repository digitale IRIS acquisisce, archivia, indicizza, conserva e rende accessibili prodotti digitali della ricerca.Tue, 18 Jan 2022 17:24:15 GMT2022-01-18T17:24:15Z101001Modeling missing data in knowledge space theoryhttp://hdl.handle.net/11577/3197349Titolo: Modeling missing data in knowledge space theory
Abstract: Missing data are a well known issue in statistical inference, because some responses may be missing, even when data are collected carefully. The problem that arises in these cases is how to deal with missing data. In this article, the missingness is analyzed in knowledge space theory, and in particular when the basic local independence model (BLIM) is applied to the data. Two extensions of the BLIM to missing data are proposed: The former, called ignorable missing BLIM (IMBLIM), assumes that missing data are missing completely at random; the latter, called missing BLIM (MissBLIM), introduces specific dependencies of the missing data on the knowledge states, thus assuming that the missing data are missing not at random. The IMBLIM and the MissBLIM modeled the missingness in a satisfactory way, in both a simulation study and an empirical application, depending on the process that generates the missingness: If the missing data-generating process is of type missing completely at random, then either IMBLIM or MissBLIM provide adequate fit to the data. However, if the pattern of missingness is functionally dependent upon unobservable features of the data (e.g., missing answers are more likely to be wrong), then only a correctly specified model of the missingness distribution provides an adequate fit to the data.
Thu, 01 Jan 2015 00:00:00 GMThttp://hdl.handle.net/11577/31973492015-01-01T00:00:00ZAssessing learning processes with a gain-loss modelhttp://hdl.handle.net/11577/3207099Titolo: Assessing learning processes with a gain-loss model
Fri, 01 Jan 2010 00:00:00 GMThttp://hdl.handle.net/11577/32070992010-01-01T00:00:00ZAssessing Parameter Invariance in the BLIM: Bipartition Modelshttp://hdl.handle.net/11577/2684331Titolo: Assessing Parameter Invariance in the BLIM: Bipartition Models
Abstract: In knowledge space theory, the knowledge state of a student is the set of all problems he is capable
of solving in a specific knowledge domain and a knowledge structure is the collection of knowledge
states. The basic local independence model (BLIM) is a probabilistic model for knowledge structures.
The BLIM assumes a probability distribution on the knowledge states and a lucky guess and a careless
error probability for each problem. A key assumption of the BLIM is that the lucky guess and careless
error probabilities do not depend on knowledge states (invariance assumption). This article proposes a
method for testing the violations of this specific assumption. The proposed method was assessed in a
simulation study and in an empirical application. The results show that (1) the invariance assumption
might be violated by the empirical data even when the model’s fit is very good, and (2) the proposed
method may prove to be a promising tool to detect invariance violations of the BLIM.
Tue, 01 Jan 2013 00:00:00 GMThttp://hdl.handle.net/11577/26843312013-01-01T00:00:00ZOn the Link between Cognitive Diagnostic Models and Knowledge Space Theoryhttp://hdl.handle.net/11577/3197065Titolo: On the Link between Cognitive Diagnostic Models and Knowledge Space Theory
Abstract: The present work explores the connections between cognitive diagnostic models (CDM) and knowledge space theory (KST) and shows that these two quite distinct approaches overlap. It is proved that in fact the Multiple Strategy DINA (Deterministic Input Noisy AND-gate) model and the CBLIM, a competence-based extension of the basic local independence model (BLIM), are equivalent. To demonstrate the benefits that arise from integrating the two theoretical perspectives, it is shown that a fairly complete picture on the identifiability of these models emerges by combining results from both camps. The impact of the results is illustrated by an empirical example, and topics for further research are pointed out.
Thu, 01 Jan 2015 00:00:00 GMThttp://hdl.handle.net/11577/31970652015-01-01T00:00:00ZL’analisi dell’Implicit Association Test con il Discrimination-Association Modelhttp://hdl.handle.net/11577/2839293Titolo: L’analisi dell’Implicit Association Test con il Discrimination-Association Model
Sun, 01 Jan 2012 00:00:00 GMThttp://hdl.handle.net/11577/28392932012-01-01T00:00:00ZKnowledge space theory, formal concept analysis, and computerized psychological assessmenthttp://hdl.handle.net/11577/2467300Titolo: Knowledge space theory, formal concept analysis, and computerized psychological assessment
Abstract: In the present study, the use of knowledge space theory (KST), jointly with formal concept analysis (FCA), is proposed for developing a formal representation of the relations between the items of a questionnaire and a set of psychodiagnostic criteria. This formal representation can be used to develop an efficient adaptive tool for psychological assessment. Rusch and Wille (1996) have shown some interesting connections between KST and FCA; these connections are applied in the construction of knowledge structures, starting from a formal context representing the relations between items and criteria. The proposed general methodology was applied, as an example, to the Maudsley Obsessional-Compulsive Questionnaire. We used a data set provided by a sample of patients with a diagnosis of obsessive-compulsive disorder to validate the obtained structures. The parameters of the basic local independence model (BLIM) were estimated for the obtained knowledge structures. The fit of each model was tested by parametric bootstrap because of the sparseness of the derived data matrix. The results are discussed in light of both psychological and methodological relapses. In particular, we propose a reinterpretation of the BLIM parameters that seems suitable for testing reliability and construct validity; furthermore, it is pointed out how the obtained structures could represent the starting point for the development of a computerized assessment tool.
Fri, 01 Jan 2010 00:00:00 GMThttp://hdl.handle.net/11577/24673002010-01-01T00:00:00ZA Poisson race model for the analysis of the Implicit Association Testhttp://hdl.handle.net/11577/2683765Titolo: A Poisson race model for the analysis of the Implicit Association Test
Abstract: The article presents a Poisson race model for the analysis of the Implicit Association Test (IAT). Four independent and parallel Poisson processes are assumed, one for each category of the IAT. Information about specific characteristics of the stimuli accumulates on the counter of each process until a termination criterion is reached and a response is given. Model parameters are the rates of information accumulation, and the amount of information that is needed before a response is given. The model accounts for both reaction time and response accuracy. The former is determined by the time at which a process wins. The latter depends on the winning process, the category of the presented stimulus, and the kind of block. An empirical application on a Conscientiousness-IAT shows the potential usefulness of the model for understanding the meaning of the implicit measure.
Tue, 01 Jan 2013 00:00:00 GMThttp://hdl.handle.net/11577/26837652013-01-01T00:00:00ZLa struttura nascosta del significato. Passare da rappresentazioni estensionali a rappresentazioni intensionalihttp://hdl.handle.net/11577/148095Titolo: La struttura nascosta del significato. Passare da rappresentazioni estensionali a rappresentazioni intensionali
Thu, 01 Jan 1998 00:00:00 GMThttp://hdl.handle.net/11577/1480951998-01-01T00:00:00ZLivelli di razionalità ed emergenza della cooperazione in dilemmi sociali a N personehttp://hdl.handle.net/11577/148094Titolo: Livelli di razionalità ed emergenza della cooperazione in dilemmi sociali a N persone
Thu, 01 Jan 1998 00:00:00 GMThttp://hdl.handle.net/11577/1480941998-01-01T00:00:00ZREL 1.0. Un programma per l'analisi dei punteggi relazionali familiari basata sui sistemi di distanze diadichehttp://hdl.handle.net/11577/148093Titolo: REL 1.0. Un programma per l'analisi dei punteggi relazionali familiari basata sui sistemi di distanze diadiche
Sun, 01 Jan 1995 00:00:00 GMThttp://hdl.handle.net/11577/1480931995-01-01T00:00:00Z