Content
validity is a concept of representative item sampling out of the universe of
a valid item population (Fitzpatrick, 1983; Klauer,
1984). Because of the specific attributes of a Rasch scaled person parameter
variance, we expect comparable Rasch Variances in any extraversion scales.
Older strategies of testing about
relationships between several measures are a strategy that leading
mostly to weak statistical testing. Testing of equivalence (deviations) is a strategy that leads to strong
statistical testing.
Methodological
issues: What factors influence the True Rasch Variance?
Especially
point seven (Bottom and Ceiling Effects) had lead to own simulation studies, they offer the opportunity to correct a bias caused
by bottom and ceiling effects.