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Mplus Discussion > Categorical Data Modeling >
 Shanshan Wang posted on Monday, November 09, 2015 - 8:26 am
Dear Dr. Muthen,

I applied a random items effect IRT model to the PISA data and saved all factor scores. I understand the S1 Mean is the value for group-specific discrimination parameter for item#1. What does the B_Y1 Mean stand for?

Thank you!
 Bengt O. Muthen posted on Monday, November 09, 2015 - 4:18 pm
B_Y1 is the random intercept for Y1, that is, the between-level component.
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