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Hi! I have questionnaire data with 4 answer categories (from not agree to agree very much). I would like to know, if it is possible to estimate a polytomous Rasch model in Mplus. If yes, how would I do it and what output do I get? |
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Yes, you would free all factor loadings and hold them equal while fixing the factor variance to one. There is nothing special that needs to be done to the thresholds. |
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Hello, I analyzed polytomous IRT model PCM using Mplus8. PCM has constraint that fix discrimination parameter to 1. But, it is not 1 at Mplus8 output. so how do I analysis PCM that constrain discrmination parameter to 1. if there are any ways, please inform me that. thank you very much. |
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We need to see your full output - please send to Support along with your license number. |
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