Measurement error in 23andme

As a broad indication of the effects of measurement error in 23andme, ancestry analysis for two identical twins is below. It suggests the decimal point isn’t yet justified. (Their Neanderthal ancestry estimates are also off by 0.1% from each other.)

Tom ancestry

Leo ancestry

 

Author: Jason Collins

Economics. Behavioural and data science. PhD economics and evolutionary biology. Blog at jasoncollins.blog

2 thoughts on “Measurement error in 23andme”

  1. OK, I don’t understand how identical twins could be different at all. They’re supposed to have the same DNA, that means that they would have the exact same SNPs.

    Unless it is due to measurement error. Of course, that means that the same person tested twice would give different results each time.

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