Searched for: author:"van der Heijden, P.G.M."
(1 - 7 of 7)
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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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Stubbe, J.H. (author), Chorus, A.M.J. (author), Frank, L.E. (author), de Hon, O. (author), van der Heijden, P.G.M. (author)
Studies on the use of performance enhancing drugs (PED) in fitness centres rely predominately on conventional survey methods using direct questioning. However, research indicates that direct questioning of sensitive information is characterized by under-reporting. The aim of the present study was to contrast direct questioning of different types...
article 2014
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Stubbe, J.H. (author), Chorus, A.M.J. (author), Frank, L.E. (author), de Hon, O. (author), Schermers, P. (author), van der Heijden, P.G.M. (author), TNO Kwaliteit van Leven (author)
book 2009
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Zwane, E.N. (author), van der Pal-de Bruin, K.M. (author), van der Heijden, P.G.M. (author), TNO Preventie en Gezondheid (author)
In multiple-record systems estimation it is usually assumed that all registration relate to the same population. In this paper, we develop a method which can be used when the registrations relate to different populations, in the sense that they cover, for example, different time periods or regions. We show that under certain conditions ignoring...
article 2004
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van der Pal-de Bruin, K.M. (author), van der Heijden, P.G.M. (author), Buitendijk, S.E. (author), den Ouden, A.L. (author), TNO Preventie en Gezondheid (author)
Objective: To study the effect of increased folic acid intake on the prevalence of neural tube defects (NTD) in The Netherlands. Study design: Using the capture-recapture method, the prevalence of NTD was estimated on the basis of five different registries on births affected by NTD. Results: Total prevalence over the 1988-1998 period varied...
article 2003
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van der Heijden, P.G.M. (author), van Buuren, S. (author), Fekkes, M. (author), Radder, J. (author), Verrips, E. (author)
The sub-scales of the SF-36 in the Dutch National Study are investigated with respect to unidimensionality and reliability. It is argued that these properties deserve separate treatment. For unidimensionality we use a non-parametric model from item response theory, called the Mokken scaling model, and compute the corresponding scalability...
article 2003
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van der Heijden, P.G.M. (author), van Puijenbroek, E.P. (author), van Buuren, S. (author), van der Hofstede, J.W. (author)
A well-known problem in spontaneous reporting systems (SRSs) for adverse drug reactions (ADRs) is under-reporting, that is, the problem that not all occurrences of ADRs are reported to the SRS. We look at the question of how to draw statistical conclusions from analyses of SRS data using reporting odds ratios. We will show that certain under...
article 2002
Searched for: author:"van der Heijden, P.G.M."
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