Please use this identifier to cite or link to this item: http://hdl.handle.net/10071/27981
Author(s): Calapez, T.
Botelho, M. do C.
Ramos, M.
Date: 2012
Title: Comparing the linear and non-linear principal component analysis over Likert-type items: An empirical study based on balanced bootstrap
Book title/volume: Bulletin of the ISI 58th World Statistics Congress of the International Statistical Institute
Pages: 5479 - 5484
Event title: 58th World Statistics Congress of the International Statistical Institute
Reference: Calapez, T., Botelho, M. do C., & Ramos, M. (2012). Comparing the linear and non-linear principal component analysis over Likert-type items: An empirical study based on balanced bootstrap. In Bulletin of the ISI 58th World Statistics Congress of the International Statistical Institute (pp. 5479-5484). International Statistical Institute. http://hdl.handle.net/10071/27981
ISBN: 978-90-73592-33-9
Keywords: Likert-type items
PCA
CATPCA
Balanced bootstrap
Abstract: The purpose of this study is to evaluate the similarity of results obtained with linear and nonlinear PCA over Likert-type items. As part of a wider project about students' perceptions of mathematics, this study analyses two dimensions: the usefulness of mathematics and the importance of understanding the concepts. Each dimension is theoretically structured by six items, three with a positive connotation and three with a negative connotation (adaptations of Fennema and Sherman, 1976 and Kloosterman and Stage, 1992). Each item is a statement that seeks to register the intensity of agreement on a 5-point scale. Four questionnaires were constructed: in the first two (A and B) the statements are evaluated by marking the response on a line segment (Visual Analogue Scale), labelled in the extreme and at the midpoint (A) or only at the extremes (B). In the third (C), Likert-type items with five labelled points are used (completely disagree, disagree, neither agree nor disagree, agree and totally agree), while in D only the extremes are labelled. This work concerns only questionnaires type C and D. Since the variables of this type are structurally ordinal variables (Gob et al, 2007), the use of a nonlinear principal components (e.g. CATPCA) is a possibility for its interdependency analysis. However, the use of linear techniques (PCA) has been widespread as a form of preferential treatment of such data. Do both techniques lead to similar results? If not, then the linearity of the treatment of such items can be questioned. Drawing on the data collected in the study mentioned, and using the balanced bootstrap as proposed in Linting et al (2007), several confidence intervals are built for the objects scores, either obtained through PCA or CATPCA, and for the correlation coefficient between paired dimensions. With these confidence intervals we expect to have a perception of the comparability of the linear and non-linear solutions.
Peerreviewed: yes
Access type: Open Access
Appears in Collections:BRU-CRI - Comunicações a conferências internacionais
CIES-CRI - Comunicações a conferências internacionais

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