GENEALOGY-DNA-L ArchivesArchiver > GENEALOGY-DNA > 2008-06 > 1213576246
From: Martin Potter <>
Subject: Re: [DNA] How could we tell?
Date: Sun, 15 Jun 2008 20:30:46 -0400
Yes, the rate probably varies widely in small samples. While Diana's
sample size of 78 might not be "very small", it might still not be
large enough to exhibit well-behaved statistics. Then, too, there are
all the social, economic and historical factors that might not average
out to produce the expected "2-5%" per generation in particular
circumstances, regardless of sample size.
> I have heard 1-2% per generation. If that is right, then the 8% figure is probably low, but of course I don't know how many generations are involved in these genealogies. That 1-2% rate probably varies a lot.
> -------------- Original message ----------------------
> From: Martin Potter <>
>> Diana wrote :
>>> I haven't run into any lab errors, that I know of. But my NPE rate is running
>>> nearly eight percent (six out of 78 subjects).
>> Thanks, Diana. Eight percent! Wow. It sounds high but I don't
>> dispute your finding. I had been led to expect "2-5%" but clearly I
>> will have to be prepared for a higher rate. Forewarned is forearmed.
>> ... Martin