Insufficient discriminant validity: A comment on Bove, Pervan, Beatty, and Shiu (2009)

A comment on "Laplacian linear discriminant analysis"

The recent paper by Tang et al. [1] has proven that Fisher’s criterion function is equal to a novel linear discriminant criterion function. The novel function is then related to spectral decomposition of the Laplacian of a graph. The equivalence between the two functions is based on Theorem 1 given in the beginning of Ref. [1]. Although some mathematical analysis is established in their paper, ...

Convergent and Discriminant Validity

Convergent and Discriminant Validity

Example: Convergent/discriminant Validity

Sociologist James A. Quinn states that the tasks of scientific method are related directly or indirectly to the study of similarities of various kinds of objects or events. One of the tasks of scientific method is that of classifying objects or events into categories and of describing the similar characteristics of members of each type. A second task is that of comparing variations in two or mo...

(Part of) the case for a pragmatic approach to validity: comment on De Houwer, Teige-Mocigemba, Spruyt, and Moors (2009).

In their review of validity of the Implicit Association Test and affective priming, J. De Houwer, S. Teige-Mocigemba, A. Spruyt, and A. Moors identified validity with establishment of "basic theoretical understanding" of the measures. It is agreed that theoretical understanding has an important role in making measures more valid and useful. Nevertheless, the authors conclude that scientific adv...