I don't see nulls (no-calls) as being a big barrier. They're scattered over the whole genome, and the adjacent alleles are likely to be in "linkage disequilibrium" -- that is, if you know the allele for the two adjacent SNPs, you can often predict what the allele would be for the no-call. That's the whole basis for the HapMap approach of using tag SNPs: we don't have to test every single base. But... I'd certainly be interested if you come up with any counter-examples. Ann Turner On Fri, Jan 6, 2012 at 9:43 AM, Sam Eaton <[email protected]> wrote: > Larry hit the nail smack dab on the head. > > One thing to remember is that we are dealing with unphased data. From > observing RAW DATA in my FF project, this is a big issue. > > It is also important to note that there can be thousands, I counted over > 5,000 in my FTDNA v2 RAW DATA, nulls in the atDNA results. Note, these seem > to be mostly false nulls. I have compared my atDNA results from 23andMe, > FTDNA v1 and FTDNA v2 and at least 90% of my nulls show up on only one > test. Nulls are typically ignored. Getting actual values for Nulls could > impact these "matches" as well. > > I expect to have some Excel 2007 and higher functions and macros written > in order to deal with some of these issues. I've been trying to write them > but my dimly remembered 10+ year old Lotus 123 for DOS and dDase IV for DOS > don't seem up to the job. > > Sam > > --------------------------------------- > > > From: Larry Vick <[email protected]> > > Linda, > > Have you asked the others if in fact they do match each other? ?Are each > of you on the others' match lists in those approximate positions on Family > Finder? > > Regards, > > Larry > > > ______________________________ > For answers to Frequently Asked Questions about mailing lists, please see: > http://dgmweb.net/MailingListFAQs.html > > > ------------------------------- > To unsubscribe from the list, please send an email to > [email protected] with the word 'unsubscribe' without > the quotes in the subject and the body of the message >