Item Response Theory Question

Our research team developed a new measure to test a latent variable in a certain population. We collected data on the same participants over four time points. I am currently running a graded response model to test how well the items perform. Currently, I am running the classical test theory and IRT analysis separately for each time point.

Is there a method to combine all four data points for each participant on the measurement instrument and run the graded response model?

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Nevin Manimala

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