Training sample

Test sample

 

 

 

R2

sample size

R2

sample size

Shrinkage

Relative Shrinkage (%)

Skin reflectance

45.7

447

35.0

186

10.7

23.4

Eye color

76.4

353

61.6

204

14.8

19.4

Hair ratio of Eumelanin-to-Pheomelanin

43.2

162

27.1

170

16.1

37.3

Total hair melanin

76.3

143

25.2

163

51.1

67.0

Table 2: Cross validation results. R2 values of the training sample and the test sample using the training sample’s beta estimates.