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Latent Dirichlet allocation - Wikipedia, the free encyclopedia

In statistics , latent Dirichlet allocation (LDA) is a generative model that allows sets of observations to be explained by unobserved groups that explain why some parts of the data are similar. http://en.wikipedia.org/wiki/Latent_Dirichlet_allocation
Richard B. Darlington http://comp9.psych.cornell.edu/Darlington/factor.htm

Factor Analysis

Good Data and Flawed Conclusions - WSJ.com

http://online.wsj.com/article/SB125970744553071829.html Is the current economic slump worse than the recession of the early 1980s? Measured by unemployment, the answer appears to be no, or at least not yet. The jobless rate was 10.2% in October, compared with a peak of 10.8% in November and December of 1982. But viewed another way, the current recession looks worse, not better. The unemployment rate among college graduates is higher than during the 1980s recession.