Dirk Pelt

5 Questions 8 Answers 0 Followers

Questions related from Dirk Pelt

Express cross-level interaction in SD units of the random slope? (HLM)

Hi, I am trying to find a way to express the importance/relevance of a cross-level interaction in a hierarchical linear model (so not in terms of significance). I have a level 2 moderator M...

20 June 2017 6,454 4 View

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 7,817 2 View

Factor analysis with computer adaptive tests: impute missings with expected probabilities?

I have a dataset with a lot of missing values due to the fact that this data was generated by a computer adaptive test. I want to show unidimensionality of the test, but factor analysis is a...

30 November 2016 5,580 7 View

Aggregation with multilevel data: always a bad idea or not necessarily?

Hi, I have daily level data nested within individuals from a diary study. Let's say I only have hypotheses on between level effects: in this case, is it then always wrong to aggregate the data...

20 October 2015 7,094 4 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 4,007 4 View