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Daco Celtic is half Irish and half Romanian on calculators this will give you something in the middle. On a commercial dna test it will give you an accurate result because they actually go through your genome and see what variants you have etc. They check your dna against references they have. If you look at Daco Celtic's actual Ancestry report and his 23&Me report it assigns the correct ethnic breakdown roughly with some small trace areas. He gets the correct Munster Cork GCs.
If you are mixed ancestry you have to take that into account when using calculators. Sometimes the 50/50 and 4 way mixes might be more accurate than the single ethnicity result. This is why you have to not take calculators are gospel. They are quite accurate for people who are fairly unmixed but even then they do not give me the correct provincial split in the ones that are broken down further i.e. half Connacht/half Munster. I usually get Ulster on them. Even with the commercial dna testing companies I've found them very accurate of course with picking up I'm Irish but on Ancestry I get no GCs from my father and on 23&Me it is the opposite I get no southern Irish and get Northern Irish. But that's still pretty good for such fine scale testing.
Mixed ancestry US people for example will still get inaccurate trace countries on commercial tests. I think the companies are quite good at assigning the bulk of your ancestry but people take some of the trace countries as factual when they are highly likely to be not genuine ancestry and will disappear with upgrades.
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