Husson, F., Lê, S., & Pagès, J. (2011). Exploratory Multivariate Analysis by Example Using R. Boca Raton: CRC Press.

Husson, F., Lê, S., & Pagès, J. (2011). Exploratory Multivariate Analysis by Example Using R. Boca Raton: CRC Press.

中山大學有電子書
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由於選項較多的變數會較選項少的變數在計算上來得有影響力(inertia),因此建議設計時問卷的選項儘量一致,但這並非必要。p.137