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van der Heijden, P.G.M. (author), van Buuren, S. (author)
Gifi was the nom de plume for a group of researchers led by Jan de Leeuw at the University of Leiden. Between 1970 and 1990 the group produced a stream of theoretical papers and computer programs in the area of nonlinear multivariate analysis that were very innovative. In an informal way this paper discusses the so-called Gifi system of...
article 2016
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Manisera, M. (author), van der Kooij, A.J. (author), Dusseldorp, E. (author)
The component structure of 14 Likert-type items measuring different aspects of job satisfaction was investigated using nonlinear Principal Components Analysis (NLPCA). NLPCA allows for analyzing these items at an ordinal or interval level. The participants were 2066 workers from five types of social service organizations. Our results suggest...
article 2010
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Theunissen, N.C.M. (author), Meulman, J.J. (author), den Ouden, L.A. (author), Koopman, H.M. (author), Verrips, E.G.H.W. (author), Verloove-Vanhorick, S.P. (author), Wit, J.M. (author)
article 2003