因子分析，瞧瞧...
http://www.r-bloggers.com/r-tuto ... ry-factor-analysis/
http://cran.r-project.org/web/packages/nFactors/nFactors.pdf
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然后再瞧瞧这儿。
The factor.pa( ) function in the psych package offers a number of factor analysis related functions, including principal axis factoring.http://www.statmethods.net/advstats/factor.html

多谢多谢！