Table 2

	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.