. Author manuscript; available in PMC: 2014 Jul 9.

Published in final edited form as: Genet Epidemiol. 2014 Jan 29;38(3):231–241. doi: 10.1002/gepi.21789

Table III.

Type I error rate and power for analysis of a dichotomous trait, by method of correction for population stratification

	Rate of type I error		Power
Correction method	No population stratification	Stratification present	No population stratification	Stratification present
No correction	0.0304	0.1354	0.948	---
Race included as covariate	0.0290	0.0692	0.945	0.885
GC	0.0084	0.0488	0.903	0.801
PC_gwas	0.0304	0.0534	0.869	0.794
PC_{GWAS_TW}	0.0290	0.0712	0.946	0.883
PC_unpruned	0.0402	0.0694	0.880	0.802
PC_r2<0.25	0.0370	0.0704	0.885	0.807
PC_r2<0.1	0.0356	0.0676	0.885	0.800
PC_0bp	0.0398	0.0650	0.840	0.749
PC_1bp	0.0392	0.0678	0.871	0.789
PC_2bp	0.0398	0.0708	0.874	0.792
PC_5bp	0.0410	0.0708	0.875	0.795
PC_10bp	0.0392	0.0718	0.880	0.797
PC_50bp	0.0390	0.0700	0.884	0.804
PC_100bp	0.0382	0.0718	0.883	0.806
SVA	0.0358	0.0794	0.790	0.689