irt

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    Rasch modelling in R

    I am currently calculating a Rasch model using the eRm package in R. However, when I want to calculate the martin-loef test using the function MLoef(res1, splitcr="median") I get the error message: Error in MLoef(res1, splitcr = "median") : Martin-Loef Test with NA currently not available Has...
  2. S

    Item Response Theory vs Confirmatory Factor Analysis

    Hi all, I was wondering what the core, meaningful differences are between Item Response Theory and Confirmatory Factor Analysis. I understand that there are differences in the calculations (focusing more on item vs. covariances; log-linear vs. linear). However, I have no idea what this...
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    [WINGEN] - Data generation with IRT

    Hello everybody, I have a simulation study and I try to generate irt data with a program called WINGEN. I want to generate dichotomously scored, normal distributed and unidimensional data. And I my number of examinees are 10000, number of items 40 and my irt model is 2PLM. WINGEN asks me...
  4. P

    Data generation study with irt

    Hello everybody, I have a simulation study and I try to generate irt data with a program called WINGEN. I want to generate dichotomously scored, normal distributed and unidimensional data. And I my number of examinees are 10000, number of items 40 and my irt model is 2PLM. WINGEN asks me...