Dirk Pelt

4 Questions 5 Answers 0 Followers

Questions related from Dirk Pelt

Difference between Chen & Thissen's (1997) LD statistic and Drasgow et al.'s (1995) "Doubles" + degrees of freedom?

Hi, I am currently looking into local (in)depence statistics for IRT models and I am confused about several handle degrees of freedom. I am dealing with binary data (items with K=2 categories) so...

03 March 2017 2,898 2 View

CFA of tests with same item format but from different test batteries: how to model it?

Hi, for a validation study of a new IQ test I have data from people taking two test batteries, say battery A and battery B. The subtests in terms of test type are the same (the usual number...

09 September 2016 2,638 6 View

How do I calculate the harmonic mean with only ks and Ns known from meta-analysis?

Hi all, I am kind of struggling with calculation of the harmonic mean for applying SEM on meta-analytic correlations. Let's say I have a 3x3 matrix with variables A, B and C. Number of samples and...

12 December 2014 7,573 2 View

Why do I obtain different results provided by SPSS and AMOS while doing the same thing?

I did a factor analysis in SPSS on 5 variables (ML method, since this is the method that AMOS uses) and saved the factor scores using the regression method. This factor Y, correlated with variable...

12 December 2014 5,186 8 View