Dirk Pelt

2 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...

27 March 2017 7,706 2 View

Can someone advise, when a factor has only two indicators: to constrain or not to constrain?

Dear all, when you only have two indicators for a factor, normally one would have to set the variance of the factor to 1 and the loadings equal to have an identified model. However, I now have...

09 April 2015 3,929 4 View