Biomedical subjects

John Tisak

Publications and source records attributed to John Tisak.

2 recordsLinked to original sources

PubMed2005

Measurement error and the correlation between positive and negative affect: spearman (1904, 1907) revisited.

There has been considerable debate in the literature on the structure of affect, especially on the correlation between positive and negative affect and the effect of measurement error on this correlation. In this brief article, it is shown that, as Spearman (1904, 1907) noted, the extent to which the correlation between imperfect measures is attenuated by measurement error depends upon the reliabilities of the measures used.

Affect↗

PubMed2004

Examining time-invariance in reliability in multi-wave, multi-indicator models: a covariance structure analysis approach accounting for indicator specificity.

A covariance structure analysis method for testing time-invariance in reliability in multiwave, multiple-indicator models in outlined. The approach accounts for observed variable specificity and permits, in addition, estimation of reliability in terms of 'pure' measurement error variance. The proposed procedure is developed within a confirmatory factor analysis framework and illustrated with data from a cognitive intervention study.

Humans↗