Gedmatch and G25 in many cases is a farce

[Lemgrant]

Same shit here. I won’t believe any company until they detect my 50% Mongolian ancestry

I know that you are joking, but that is not gonna happen. I saw your photos and I see nothing Mongolian in your appearance. Your central Asian side is mixed.

[JamesBond007]

People often wondering why only 23andme shows accurate results, but everything else fails. Like for instance in case of Ljubic, a Bosnian-Croat with 12,5% German and some Bulgarian ancestry.
The reason his 12,5% German is undetectable by calculators, G25 and AncestryDNA, is because he has some more south influence, which overall places him back in his Bosnian-Croat average in terms of admixture proportions. While 23andme relies on IBD sharing info and accurately assigns NW euro to him. >> https://www.theapricity.com/forum/sh...3andMe-results

Here is example for Eurogenes k13. Let's say we have an average Austrian who is 12.5% Serbian and 12.5% English. So 75% Austrian, 12.5% Serbian, 12.5% English. As an Austrian, he has influence from North (English) and South (Serbian), which ends up in average Austrian results in admixture proportions.

k13(c(37.61,28.72625,14.6625,7.15125,8.7625,1.49375,0.76125,0.12875,0.22125,0.17125,0.2075,0.08125,0.0125),k=30)
      [,1]                   [,2]     
 [1,] "Austrian"             "1.3376" 
 [2,] "East_German"          "4.4093" 
 [3,] "Hungarian"            "6.5641" 
 [4,] "West_German"          "8.4429" 
 [5,] "South_Dutch"          "9.7973" 
 [6,] "North_German"         "11.5536"
 [7,] "Croatian"             "12.8212"
 [8,] "Serbian"              "12.9474"
 [9,] "French"               "13.5631"
[10,] "Danish"               "14.4383"
[11,] "Moldavian"            "14.4663"
[12,] "Swedish"              "14.6663"
[13,] "North_Dutch"          "14.7111"
[14,] "Southeast_English"    "14.8363"
[15,] "North_Swedish"        "15.5049"
[16,] "South_Polish"         "15.7174"
[17,] "Orcadian"             "16.0359"
[18,] "Norwegian"            "16.1109"
[19,] "Southwest_English"    "17.1136"
[20,] "Irish"                "17.2369"
[21,] "Ukrainian_Lviv"       "17.2987"
[22,] "Romanian"             "17.4154"
[23,] "West_Scottish"        "18.166" 
[24,] "Ukrainian"            "18.4077"
[25,] "Polish"               "19.4827"
[26,] "Southwest_Finnish"    "19.5934"
[27,] "PL_UKR_BEL_South_RUS" "20.7604"
[28,] "Bulgarian"            "20.8938"
[29,] "Spanish_Cataluna"     "21.1994"
[30,] "Spanish_Galicia"      "21.3998"

k13(c(37.61,28.72625,14.6625,7.15125,8.7625,1.49375,0.76125,0.12875,0.22125,0.17125,0.2075,0.08125,0.0125),k=30,mixedmode=T)
      [,1]                                               [,2]    
 [1,] "8.2% French + 91.8% Austrian"                     "0.5543"
 [2,] "12.2% West_German + 87.8% Austrian"               "0.6468"
 [3,] "4.6% Spanish_Murcia + 95.4% Austrian"             "0.6511"
 [4,] "5.2% Spanish_Cataluna + 94.8% Austrian"           "0.6707"
 [5,] "4.5% Spanish_Valencia + 95.5% Austrian"           "0.705" 
 [6,] "5% Portuguese + 95% Austrian"                     "0.7103"
 [7,] "4.8% Spanish_Castilla_Y_Leon + 95.2% Austrian"    "0.7157"
 [8,] "4.1% Spanish_Andalucia + 95.9% Austrian"          "0.737" 
 [9,] "4.5% Spanish_Extremadura + 95.5% Austrian"        "0.7396"
[10,] "4.3% Spanish_Castilla_La_Mancha + 95.7% Austrian" "0.7503"
[11,] "3.9% Spanish_Aragon + 96.1% Austrian"             "0.7522"
[12,] "4.7% Spanish_Galicia + 95.3% Austrian"            "0.8083"
[13,] "9.8% South_Dutch + 90.2% Austrian"                "0.8144"
[14,] "4.2% Spanish_Cantabria + 95.8% Austrian"          "0.8477"
[15,] "4.2% North_Italian + 95.8% Austrian"              "0.8608"
[16,] "3.3% Tuscan + 96.7% Austrian"                     "0.9385"
[17,] "3.9% Southwest_French + 96.1% Austrian"           "0.9446"
[18,] "2.5% French_Basque + 97.5% Austrian"              "0.9845"
[19,] "2.4% West_Sicilian + 97.6% Austrian"              "1.034" 
[20,] "2.5% Italian_Abruzzo + 97.5% Austrian"            "1.0477"
[21,] "1.7% Sephardic_Jewish + 98.3% Austrian"           "1.0581"
[22,] "1.7% Italian_Jewish + 98.3% Austrian"             "1.0584"
[23,] "1.5% Tunisian_Jewish + 98.5% Austrian"            "1.0905"
[24,] "1.9% South_Italian + 98.1% Austrian"              "1.0941"
[25,] "1.5% Libyan_Jewish + 98.5% Austrian"              "1.0987"
[26,] "1.6% Algerian_Jewish + 98.4% Austrian"            "1.1048"
[27,] "95.2% Austrian + 4.8% Southeast_English"          "1.1128"
[28,] "1.4% Sardinian + 98.6% Austrian"                  "1.1258"
[29,] "1.9% East_Sicilian + 98.1% Austrian"              "1.1363"
[30,] "1.7% Ashkenazi + 98.3% Austrian"                  "1.1448"

I see what you are saying and you make some good points but some people want to know what their number one closest modern population is. There are no pure Europeans for instance someone who is a mix of Irish, German and English may show up as English on non-ICB methods but this information is not false per se but is another interpretation I..E. it represents the person's most similar single modern ethnic group. Same for your Austrian, English and Croatian example and many other examples .

[Lemgrant]

I see what you are saying and you make some good points but some people want to know what their number one closest modern population is. There are no pure Europeans for instance someone who is a mix of Irish, German and English may show up as English on non-ICB methods but this information is not false per se but is another interpretation I..E. it represents the person's most similar single modern ethnic group. Same for your Austrian, English and Croatian example and many other examples .

Half Romanian and half Irish gets French or Austrian-Swiss as closest population. That information is useful only to see how evenly you got your Romanian and Irish genes from your parents. If you plot closer to Romanian on PCA (with Euclidean distances), that probably means that you are not exactly 50-50 of what you know.

[Bakha]

I know that you are joking, but that is not gonna happen. I saw your photos and I see nothing Mongolian in your appearance. Your central Asian side is mixed.

Yeah I know

[JamesBond007]

Half Romanian and half Irish gets French or Austrian-Swiss as closest population. That information is useful only to see how evenly you got your Romanian and Irish genes from your parents. If you plot closer to Romanian on PCA (with Euclidean distances), that probably means that you are not exactly 50-50 of what you know.

I dunno I think some Gedmatch calculators are more suited to different populations and that many suffer from the calculator effect. For instance, I think K15 is superior to K13 for the British isles because it breaks down the north-atlantic category into north sea and Atlantic categories but that it is missing some populations and that I would like to see on it and EUtest version 1 is the best for people like me who have no amerindian or east Asian admixture. Not all calculators are equal.

Someone who is 50 percent north European and 50 percent south European should better approximate French one would think.

[Grace O'Malley]

I agree that calculators will only take into account your overall genetics so if you are half English and half Serbian you will plot somewhere in Germany (approximately) but if 23&Me uses IBD sharing why do people like Italians get so much MENA for instance and why do North Africans get so much Iberian? Is that due to IBD.

[marco]

We don’t get so much Iberian in 23 and me lol who told you that. I’ve seen the latest updates for North Africans and we don’t score a lot of Iberian

[Grace O'Malley]

We don’t get so much Iberian in 23 and me lol who told you that

I've seen North Africans who do and also people like Armenians getting a lot of Italian and Greek. It's not uncommon from reading 23andMe.

[marco]

Show me these results in the latest update, I’m up to date on North African results and I haven’t seen any North Africans score. High percentage of Iberian in latest update

[Samnium]

I dunno I think some Gedmatch calculators are more suited to different populations and that many suffer from the calculator effect. For instance, I think K15 is superior to K13 for the British isles because it breaks down the north-atlantic category into north sea and Atlantic categories but that it is missing some populations and that I would like to see on it and EUtest version 1 is the best for people like me who have no amerindian or east Asian admixture. Not all calculators are equal.

Someone who is 50 percent north European and 50 percent south European should better approximate French one would think.

French average surely but actually the upper part of France can't be modeled like that.

The "french average" is drifted further south by the whole "southern" regions. SW french is iberian-like. SE France is somewhere between Iberia and N.Italy but a bit more northern. Britons and Normans are "british"-like. Here people drift strongly towards W.Germany.

I think the midpoint would be something like Central France.