nor azila
2023-Sep-07 23:09 UTC
[R] Error in finding factor scores/ person ability in item response theory
Dear R users, I have encountered some error in finding factor scores/ person ability in item response theory. I tried a few times using ltm and mirt package but it still gave me error. #TRY #1 - Fit GPCM model using ltm> irt_model <- gpcm(response_matrix)> irt_person_abilities <- fscores(irt_model)*Error in object at Model : * * no applicable method for `@` applied to an object of class "gpcm"* #TRY #2 - Fit GPCM model using ltm> irt_model <- gpcm(data = HT, constraint = "1PL")> irt_person_abilities <- factor.scores(irt_model)*Error in factor.scores(irt_model) : * * argument "f" is missing, with no default* #TRY #3 - Fit GPCM model using mirt> irt_model <- mirt(data = HT, model = "gpcm", itemtype = "graded")*Error in model$x[i, "Type"] : subscript out of bounds* *In addition: Warning message:* *In cbind(model$x, OptionalGroups = "") :* * number of rows of result is not a multiple of vector length (arg 2)*> irt_person_abilities_dim1 <- fscores(gpcm_model, method = "EAP", dims = 1)*Error in object at Model : * * no applicable method for `@` applied to an object of class "gpcm"* I am not sure which package is suitable with my data (Polytomous - Partial Credit Model) and why it always turns out to be an error. Thank you very much for any help given. Azila. [[alternative HTML version deleted]]