From: arch.zhou@gmail.com   
      
   Both of the two methods are unsupervised learning methods. Clustering   
   tries to group similar objects together, and PLSA can estimate the   
   values of P(z|d), that are the probabilities of topics given the   
   document. The probabilities P(z|d) are also used in clustering methods   
   such as unsupervised naive bayes .  The cluster a document belongs to   
   is determined by z = argmax_z P(z|d) in clustering methods.   
   The similar approach can be applyied to PLSA, so can PLSA be thought of   
   a clustering method?   
      
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