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On the construction of all factors of the model for factor analysis.

Krijnen, Wim P (Statistical Techniques For Applied Research)

A construction method is given for all factors that satisfy the assumptions of the model for factor analysis, including partially determined factors where certain error variances are zero. Various criteria for the seriousness of indeterminacy are related. It is shown that B. F. Green's (1976) conjecture …

2002-03-01AlgemeenArtikel

A note on the parameter set for factor analysis models

Krijnen, Wim P. (Statistical Techniques For Applied Research)

Mycotoxins are small (MW approximately 700), toxic chemical products formed as secondary metabolites by a few fungal species that readily colonise crops and contaminate them with toxins in the field or after harvest. Ochratoxins and Aflatoxins are mycotoxins of major significance and hence there has …

1999-03-01AlgemeenBoekdeel

Some new results on correlation-preserving factor scores prediction methods

ten Berge, Jos M.F.; Krijnen, Wim P. (Statistical Techniques For Applied Research); Wansbeek, Tom; Shapiro, Alexander

Anderson and Rubin and McDonald have proposed a correlation-preserving method of factor scores prediction which minimizes the trace of a residual covariance matrix for variables. Green has proposed a correlation-preserving method which minimizes the trace of a residual covariance matrix for factors. …

1999-03-01AlgemeenArtikel

Conditions for factor (in)determinacy in factor analysis

Krijnen, Wim P. (Statistical Techniques For Applied Research); Dijkstra, Theo K.; Gill, Richard D.

The subject of factor indeterminacy has a vast history in factor analysis (Guttman, 1955; Lederman, 1938; Wilson, 1928). It has lead to strong differences in opinion (Steiger, 1979). The current paper gives necessary and sufficient conditions for observability of factors in terms of the parameter matrices …

1998-12AlgemeenArtikel

Algorithms for unweighted least-squares factor analysis

Krijnen, Wim P. (Statistical Techniques For Applied Research)

Estimation of the factor model by unweighted least squares (ULS) is distribution free, yields consistent estimates, and is computationally fast if the Minimum Residuals (MinRes) algorithm is employed. MinRes algorithms produce a converging sequence of monotonically decreasing ULS function values. Various …

1996-02-01AlgemeenArtikel

The measurement of social support in the "European Research on Incapacitating Diseases and Social Support": the development of the Social Support Questionnaire for Transactions (SSQT)

Suurmeijer, Theo P; Doeglas, Dirk M; Briancon, Serge; Krijnen, Wim P (Statistical Techniques For Applied Research)

Investigated if the SSQT allows for meaningful comparisons between patients with rheumatoid arthritis from different countries and explored the dimensionality and invariance of the SSQT dimensions. Based on types of social support, the authors formulated a series of items to measure actual supportive …

1995AlgemeenArtikel

An efficient algorithm for PARAFAC of three-way data with large numbers of observation units

Kiers, Henk A.L.; Krijnen, Wim P. (Statistical Techniques For Applied Research)

The CANDECOMP algorithm for the PARAFAC analysis of n × m × p three-way arrays is adapted to handle arrays in which n > rnp more efficiently. For such arrays, the adapted algorithm needs less memory space to store the data during the iterations, and uses less com- putation time than the original CANDECOMP …

1991-03AlgemeenArtikel

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