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| Training data worsens fit of mixture ... |
 
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| i have fit several sets of models with and without training data. in each case, introducing the training data has worsened model fit as measured by BIC. should i conclude from this that the training data is not very accurate (a possibility) or is there a statistical reason for this phenomenon? |
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| The metric of the likelihood changes when training data are introduced, so BIC values are not comparable with and without training data. |
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| I assume the same would hold for two different sets of training data, i.e., the BIC would not be comparable. |
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| Right. |
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