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Is there a variation of Latent Dirichlet Allocation (LDA) for grouped data? As an example, let us consider corpus of all Yahoo Q&A (where for simplicity we consider a question lumped together with all the corresponding answers as a document). While submitting a question to Yahoo's site, user has to specify a category to which it belongs to (let us, again for simplicity assume that categories are simple, instead of hierarchical). Is there a version of LDA that takes advantage of this information?

Nick Cox
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abhinavkulkarni
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    LDA means linear discriminant analysis to many people here. Important to spell out what you mean. Locally famous terminology is not necessarily globally familiar. – Nick Cox Aug 08 '13 at 08:33

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Have a look at Labeled LDA.

Ramage et al.: Labeled LDA: A supervised topic model for credit attribution in multi-labeled corpora

there is even an implementation available

benroth
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