Well you have to apply a level of interpretation. If you look at it logically, it generally makes sense unless there is a problem with the calculator itself.
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They can give you an idea of, well lets say you are a quarter Dutch, a quarter German, a quarter Italian, and a quarter Polish. The tests will always say that you are about 25% Southern and 75% Northern European, but it will always give you some random populations. Maybe it will say you are 50% French, etc... The tests don't pinpoint specific nationalities. So how are they anymore useful than the ones you pay for on 23andMe which give you specific nationalites? Some test might say you are 2.33 percent Mozabite when really you are Italian, so what is the point?
Well if you have a more complex ancestry the answer is going to be more complex too, but the answers do make logical sense. The populations it gives are based on their average scores compared to yours. So while it may for example say someone who is for example 75% British 25% Italian is actually French, but this makes logical sense.
Well you have to understand that everyone is on a genetic spectrum. These programs look at genetic components, and each group has a particular average composition, so if you are very close to their average composition you will show up as being similar to them, whether that's because that person is actually French, or because they are a mix of people that averages out close to the French average, it is not always able to tell. Although usually a mixed person will find that they are represented as (for example) something close to 75% British 25% Italian on the mixed mode, rather than just French. I would recommend the most recent Eurogenes tests as they have the best track record, especially when it comes to the mixed-mode oracle.
Basically your genetic profile is a numerical problem that the program solves by comparing it to other identities (country averages in this case) in it's database. It's purely a mathematical thing, and looks at ancestral components rather than diseases and physical features - which are usually less useful in distinguishing groups of people. I know that a good genetic calculator can place a person in their country without much trouble, and often the mixed mode is very close to reality.
Yes the french are their own ethnicity, however you being 75% brit and 25% italian the closest population to your average are the french that's why it shows up. Genetically it also makes sense as french ancestry would be like british but with a pull towards southern-Europe.
I think Harappa world is the worst for people of mixed southern European and Northern European ancestry..
Look at my Harappa results in mixed mode:
Using 2 populations approximation:
1 50% ashkenazy-jew +50% utahn-white @ 3.865
2 50% ashkenazi +50% french @ 4.000
3 50% ashkenazy-jew +50% british @ 4.071
4 50% italian +50% romanian-a @ 4.134
5 50% italian +50% serbian @ 4.304
6 50% ashkenazi +50% utahn-white @ 4.436
7 50% ashkenazy-jew +50% utahn-white @ 4.565
8 50% ashkenazi +50% british @ 4.712
9 50% ashkenazy-jew +50% n-european @ 4.923
10 50% hungarian +50% tuscan @ 4.996
71253 iterations.
From Eurogenes I like Eurogenes EUtest k12b and k13 the most.
From dodecad I like V3, world 9 and k12b the most.
MDLP k12 and k10 is good enough.
Dodecad k12b.