It is hard to believe in some ancestry results. FamilyTreeDna's new Ancient Origins give me following results
Metal Age Invader 12%
Regarding Metal Age Invaders they refer to the Metal Age Yamnaya culture, regarding Farmers to the Neolithic Anatolian migration to Europe and regarding Hunter-Gatherers to ancient LaBrana, Loschbour and Motala samples. Regarding non-European proportion they give a hint to look at myOrigins, which is FamilyTreeDna's admixture analysis based on present-day populations. My myOrigins give me only one non-European group, Middle Easterners. I doubt it, the non-European in my Ancient Origins test is likely Asian.
Going further in analyzing results I compared my Ancient Origin results to scientific papers, Haak et al. 2015 giving comparable results. Haak et al. gives following results for Finns:
EN (Farmers) 31.5%
Nganasan (Asian) 10.2%
WHG (Hunter-Gatherer) 7.9%
Yamnaya (Metal Age Intrurers) 50.4%
Respectively Norwegians get in this study
EN (Farmers) 48.2%
Nganasan (Asian) 4.2%
WHG (Hunter-Gatherer) 0%
Yamnaya (Metal Age Intrurers) 47.5%
We can see a huge transition between Yamnayas/Iron Age Intruders and Hunter-Gatherers between Ancient Origins and Haak et al. I know something about the method used by Haak et al., but I have no idea what FamilyTreeDna did. However, if I try to guess, I would say that they could have used a very drastic LD-pruning. I can get similar differences by heavily pruned data and it makes sense. Metal-Age invasion to Europe happened during the Bronze Age, thousands years later than the arrival of hunter-gatherers. So it is reasonable to assume that we have still much more Bronze Age genetic drift than drift from hunter-gatherers, thus removing LD removes more ancestry of Metal Age Intrurers. Pruning present-day samples does't have same effect due to more similar genetic composition.
I made also some admixture tests. Pruning LD gives a big change in ancient admixtures.
My result without pruning
and after pruning
I am not saying that the difference between results of FamilyTreeDna and Haak et al. is caused by pruning, because I don't know it. I only state that pruning ancient samples is risky.