My AncestrybyDNA results conformed closely to what I would have conjectured based on documents and the family history. It was roughly consistent with a person who has one Native American great-grandparent, one European great-grandparent, and six sub-Saharan African great-grandparents. Now, I actually have this "tri-racial" admixture on both sides of the family, but I find it better to report admixture in terms of whole people instead of percentages. That said, my percentage for East Asia was zero, as I would have expected.

I believe that the argument that ABDNA did not sample from a specific tribe, as a basis for explaining a disappointing 0% result for Native American, is faulty. The Germans, French, and Spanish populations share certain genomic frequencies that are not specific to ethnicity, but to general and ancient continental commonalities. The same can be said for the Mohawk, Choctaw, Shawnee, etc. If your percentage for Native American is 0, you almost certainly don't have very much Native American ancestry. At any rate, look at the confidence intervals, which indicate how far removed from the Maximum Likelihood Estimate of 0 you might be.

I have submitted a sample to 23andme and do expect it to be roughly close to what I got from ABDNA. Note that 23andme only breaks out Asian, Indo-European, and Sub-Saharan African. Native American and Asian are lumped together by 23andme, when reporting percentages. I would expect my 23andme Asian percentage to correspond closely to my ABDNA Native American percentage, since my ABDNA East Asian percentage was 0.