We were hoping to test the viability of a new type of statistical test on type 1 and 2 error rates using a trait which has been well-explored with many GWAS hits in the GWAS catalog (e.g. height or BMI). To do this, we would ideally have genotypes from the same platform or imputed dosages for a very large sample that is well-established. This post was asked before here and elsewhere.
Some ideas included the WTCCC data, (though it was done on different platforms and we'd rather not impute,) GIANT (which comes from several investigators and platforms and is not in one place.) But I don't know if they can release imputed dosages. Has anything changed on this? Are there any open genotype-phenotype GWAS datasets? Or must most requests still go through dbGAP? And what is the largest single-stage, single-platform GWAS or single-source for which imputed data is available?