how many parameters do you need to fit an itr model what kind of software is used to fit models what is rast/rasch used for what type of rast model is used for test questions? rast/rast model definition what is the standard error range for the rast model how to do an itr model in rasch how to fit an irt model how many people can fit one parameter model rast/rabsch modeling what modeling techniques are used for questionaire? how many questions are required to fit an irt model what is radsch modeling physics rast model is used for how many questions what is reglas modeling with standard error rast/retsch modeling with very large n what is the model for rast how many parameter in rasch modeling what is an irt model what to use for rast model