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Jon Heron posted on Wednesday, August 05, 2015 - 11:24 am
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Dear Bengt/ Linda I have just been experimenting with the BCH three-step method. I took a simple example with a single continuous outcome. I estimated within-class means using the auxiliary command and then repeated the same model after exporting the BCH weights following the method described in webnote-21. This gives me the same estimated means (as of course it should) however in the second approach using training data I am quoted an entropy value of 1.501. Is this anything to be concerned about? As I say, the model replicated with no other apparent problem. best wishes, Jon |
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That sounds odd. Do you mind sending files to support so we can look into it? |
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Jon Heron posted on Monday, August 10, 2015 - 6:48 am
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Hi Bengt in prepping a set of files to send to you, I thought as a quick check I would export "cprobs" from my third-step model which uses the BCH weights as training data. I discovered that the cprobabilities are identical to these BCH weights. I think this explains why entropy is out of bounds and all my classification matrices are nonsensical. Some BCH weights are negative - but this is fine as mentioned in Vermunt (2010). I obtain the correct answer from the model (correct = agrees with aux approach) but the classification summaries should probably be ignored. This may be enough info for you, but I have the files here ready if you still need me to send. best, Jon |
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Thanks. |
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Jon - do you mind sending the files. Seems like we need them after all. |
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The BCH weights use probabilities that are negative and >1 so the entropy is technically not even defined because of LOG of negative values. We will not print it in the next version for this case. |
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Fred Danner posted on Tuesday, September 22, 2015 - 3:40 pm
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I had exactly the same question (for a similar analysis that I had a colleague run for me with version 7.31)and am pleased to learn that I can ignore my entropy and classification probabilities > 1 output. However, I just purchased 7.31 and re-ran the same syntax but received an error message: Unrecognized setting for SAVE option: BCHWEIGHTS is this because I did not first delete my version 7.1 when downloading 7.31? |
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Look at the top of the output to see whether 7.1 or 7.31 is being used. I suspect 7.1. You should not have more than one copy of Mplus.exe on your computer. |
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Fred Danner posted on Tuesday, September 22, 2015 - 11:35 pm
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That must be it -- I still have the old 7.1 Mplus.exe on my computer. I will uninstall everything and re-download. Thanks! |
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