Additional file 4.

Type I error for a case when genotype AB is tested against AA and BB. Type I error for 1df variance homogeneity tests when AB is tested against AA and BB when there is effect of SNP which explains 0%, 1%, and 5% of total trait's variance for different frequency of interacting allele (5%, 10%, 25% and 50%) and for different distribution of residual error (normal, three types of t and chi square distribution ).

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Struchalin et al. BMC Genetics 2010 11:92   doi:10.1186/1471-2156-11-92