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Table 2 Combinations of independent variable groups

From: Development and validation of a risk index to predict kidney graft survival: the kidney transplant risk index

Combination No Order of variable selection Final number of variables or components
Combination 1 EO 40 variables
Combination 2 PCA 51 components
Combination 3 EN 46 variables
Combination 4 EO PCA 37 components
Combination 5 EO EN 27 variables
Combination 6 EN PCA 37 components
Combination 7 EO EN PCA 23 components
  1. EO Expert opinion; PCA Principal component analysis; EN Elastic net