Eighteen kinds of current QSAR parameters were analysed by the cluster analysis, and divided into 4 groups, namely, cluster 1=σ
i, |σ
i|, σ
m, F ; cluster 2=σ
π, σ
p, R ; cluster 3=MR, Pr, Vw, σ
s°, △S°, π, Es, Mw ; cluster 4=|σ
π|, ι, μ. Of the eight kinds of parameters belonging to cluster 3, MR, Pr, and Vw can be substituted by σ
s°, whereas π (aromatic group) and Es are expressed by the linear combination of σ
i, σ
π and σ
s°.
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