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Student 09 posted on Wednesday, June 24, 2009 - 7:38 am
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Hi my question of understanding refers to ypsilon in formula (1) in the Muthén (1994) SMR article, p. 379. Here, ypsilon is labelled as a measurement intercept vector. So, would it be correct that a) ypsilon is the vector of the randomly varying intercepts of variables measured at the within-level b) these intercepts represent the (estimated) group means of the variables measured at the within-level c) but don't represent grand means? Many thanks |
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The intercepts (actually "nu's") are randomly varying across the cluster units, that is, on the Between level. Their means are presented on the Between level; these are the grand means. So, for a given item nu_j = nu + epsilon_j where nu_j is the intercept conditional on being in cluster j and nu is the overall (grand) mean. |
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Student 09 posted on Wednesday, June 24, 2009 - 9:16 am
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thanks a lot! |
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Student 09 posted on Thursday, June 25, 2009 - 11:56 pm
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Hello, shouldn't the mplus approach to twolevel modelling also allow to model formative (as opposed to reflective) measurement models within- and between groups ? If so, could you please suggest any references in this regard ? |
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Yes, formative measurement models can be specified in a multilevel model. See the Topic 1 handout for how to specify a formative model in Mplus. |
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