23andMe DNA tests claim to tell you what proportion Neanderthal you are. I, for example, have just under 2% Neanderthal DNA (allegedly), which they say is in the 47th percentile.
From what I understand they test for some fraction, like 1/4 to 3/8 ish of total number of known Neanderthal SNPs. Dunno quite how representative that is of the total but I imagine probably a decent correlation.
However, around 2013-14 they either changed the number of SNPs they considered Neanderthal origin or their algorithm changed, and I was PISSED because I went from 95th percentile to 47th-ish myself.
However, around 2013-14 they either changed the number of SNPs they considered Neanderthal origin or their algorithm changed, and I was PISSED because I went from 95th percentile to 47th-ish myself.