Is this a good questionnaire? 

one of the best lectures on psychometrics in the history of psychometrics. Thank you Doc. Combrinck

I use conquest but I have with the commands for run analysis for each dimension. because I want to measure dimensionality. any advice?

Hi Dr Combrinck, great presentation. One question, can rasch analysis be used to transform existing measures from ordinal to interval ? Or is it just used to validate those ordinal measures

very informative

Your statement about Ordinal scales and Interval scale is questionable, R U sure?