I intend to investigate the psychometric properties of a SAT with a 3PLM of the IRT. The total population of my study is 16,328 and, I was told that Krayjcie and Morgan cannot be used as a yardstick for determining my sample size since I'm running my analysis with an IRT software. Thus, will require much larger sample.
I agree number of items, scales, and types of model will play a big part in determing minimum calculations! However, saying that have a look at general rule of thumb for these type of analysis. Sorry cant be much help! Good luck.
Hello Ibrahim,
The number of items, scale correlations, the specific IRT model, the degree of guessing (for 3PL models), and the choice of uni/multidimensional models all make a difference. You could always run your own simulation to make a determination!
Here are a couple of references that you may find helpful:
https://files.eric.ed.gov/fulltext/EJ1130806.pdf
http://aphasiology.pitt.edu/2309/1/49-64-1-RV-Hula.pdf
Article Sample Size Requirements for Estimation of Item Parameters i...
Good luck with your work.
I agree number of items, scales, and types of model will play a big part in determing minimum calculations! However, saying that have a look at general rule of thumb for these type of analysis. Sorry cant be much help! Good luck.
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