Does 23andme overestimate major components whilst underestimating minority components?

[Iloko]

Kurd from Anthrogenica(creator of the Gedrosia gedmatch calculators) said this in a post:

23andMe's speculative mode greatly overestimates major components, and underestimates minor components. This is due to their methodology of snipping the genome into 100 SNP segments to compare against the limited references they have. So for example, if 60% of the the segment indicates Middle Eastern, and 40% indicates S Asian, that segment is assigned 100% Middle Eastern. In effect 40% of the segment, which is S Asian is ignored, and the whole segment is assigned Middle-Eastern.

Also, their methodology includes segment smoothing, which means if there are chunks of minor components in a segment, they are ignored.

That is how Iranians and W Asians turn out 98-100% Middle Eastern, and folks in neighboring Pakistan turn out 98-100% S Asian in speculative mode.

This naturally is unrealistic and uninformative, because you don't need a test to tell you that. Conservative mode is better with regards to inflation of major components and underestimation of minor components, but the trouble here is that people get 5-70% unassigned. This is where your minor components are hidden.

The above translates to 23andMe being useless for figuring out your minor components to any degree of accuracy

Source: http://www.anthrogenica.com/showthre...l=1#post145261

[Hadouken]

that guy has an agenda bro . he is a baloch from pakistan with minor additional kurdish roots if any . he is constantly trying to shift certain populations in a way to fit his plan/agenda . thats why he says this . 23andme shows your ethnic heritage from the last 500 years in form of bounded geographical areas you are native to . on gedmatch your genome gets broken down further in more detailed components in a larger than 500 year past timeframe

[Peterski]

Yes, I agree. Kurd is right. They are generally very "careful". I mentioned this here:

http://www.theapricity.com/forum/sho...12#post4372512

23andMe experts are very careful (which is why they have all of these "Broadly something" things). Nothing is noise there. I would say that they are actually too careful with detecting admixtures.

By too careful I mean reluctant to tell you about minor or "uncertain" admixtures.

And Petalpusher also mentioned the same thing here:

http://www.theapricity.com/forum/sho...=1#post3654911

In my observation 23andme underestimates it, especially when someone still plots in a very West Euro countries. It might look unsure so it ends up mostly in broadly, even in spec.

As for this:

23andme shows your ethnic heritage from the last 500 years in form of bounded geographical areas you are native to . on gedmatch your genome gets broken down further in more detailed components in a larger than 500 year past timeframe

Well, this could also be true.

But Maciamo from Eupedia argues that 23andMe probably shows 2000 years, not 500...

[Dick]

that guy has an agenda bro . he is a baloch from pakistan with minor additional kurdish roots if any . he is constantly trying to shift certain populations in a way to fit his plan/agenda . thats why he says this . 23andme shows your ethnic heritage from the last 500 years in form of bounded geographical areas you are native to . on gedmatch your genome gets broken down further in more detailed components in a larger than 500 year past timeframe

Dosnt surprise me. They probably all have agendas except for Punt. I don't see why a Somali would have an agenda.

[Hadouken]

Dosnt surprise me. They probably all have agendas except for Punt. I don't see why a Somali would have an agenda.

I still like "Kurd"s calculators and am thankful that he creats them . he also seems to be a nice guy but as I said he is not Kurdish but is descendent from people who have ancient kurdish roots who immigrated to pakistan and mixed with balochs or whatever . and if I recall his tribe is called "Kurd" . never heard of those people to begin with but it is similar to a brazilian mixed person of several things claiming to be portuguese . he says many dumb stuff regarding my ethnicity but I cant do anything it wouldnt "help" anyway . all I can do is to post my own results as a REAL kurd.

if you want I can show you some of his results on gedmtach that I found and then show you mine as comparison . you would throw your arms on your head I am serious

I just have ot accept that my ethnicity gets misrepresented and trolled a lot I guess

[Dick]

I still like "Kurd"s calculators and am thankful that he creats them . he also seems to be a nice guy but as I said he is not Kurdish but is descendent from people who have ancient kurdish roots who immigrated to pakistan and mixed with balochs or whatever . and if I recall his tribe is called "Kurd" . never heard of those people to begin with but it is similar to a brazilian mixed person of several things claiming to be portuguese . he says many dumb stuff regarding my ethnicity but I cant do anything it wouldnt "help" anyway . all I can do is to post my own results as a REAL kurd.

if you want I can show you some of his results on gedmtach that I found and then show you mine as comparison . you would throw your arms on your head I am serious

I just have ot accept that my ethnicity gets misrepresented and trolled a lot I guess

This Indian trolled people that actually paid for dna testing. Wasn't free like gedmatch.

http://www.theapricity.com/forum/sho...amnaya-(FTDNA)

[Peterski]

I don't see why a Somali would have an agenda.

My ex-soldier neighbor knows why. He worked as a mercenary, fighting against Somali pirates.

[Dick]

My ex-soldier neighbor knows why. He worked as a mercenary, fighting against Somali pirates.

ok, excluding Wadaad.

[Hadouken]

This Indian trolled people that actually paid for dna testing. Wasn't free like gedmatch.

http://www.theapricity.com/forum/sho...amnaya-(FTDNA)

[Peterski]

ok, excluding Wadaad.

Wadaad too. Wadaad escaped from my neighbor to Canada.