1. factor analysis
Wikipedia definition
2. Factor analysisFactor analysis is a statistical method used to describe variability among observed, correlated variables in terms of a potentially lower number of unobserved variables called factors. In other words, it is possible, for example, that variations in three or four observed variables mainly reflect the variations in fewer such unobserved variables. Factor analysis searches for such joint variations in response to unobserved latent variables.
Read “Factor analysis” on English Wikipedia
Read “因子分析” on Japanese Wikipedia
Read “Factor analysis” on DBpedia


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