Additional file 2.

Type I error for a case when all three genotypes are tested against each other. Type I error for variance homogeneity tests 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