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Archiver > DNA-R1B1C7 > 2007-11 > 1195658395


From: "Richard B. Hare" <>
Subject: Re: [DNA-R1B1C7] DNA-R1B1C7 Digest, Vol 1, Issue 134
Date: Wed, 21 Nov 2007 10:19:55 -0500
In-Reply-To: <d69.17c61260.3475a311@aol.com>


FOR EXAMPLE
Do a survey at the train station: Choose passengers awaiting train arrival

Congratulations! That is the best explanation I've ever heard to explain
data variation attributable to sample size. People can grasp it intuitively
without a degree in statistics. Thank you.
Dick

-----Original Message-----
From:
[mailto:] On Behalf Of
Sent: Wednesday, November 21, 2007 10:05 AM
To:
Subject: Re: [DNA-R1B1C7] DNA-R1B1C7 Digest, Vol 1, Issue 134


In a message dated 11/21/2007 2:00:52 A.M. Central Standard Time,
writes:

.Hey R1B1C7's if you want to have
some fun ? Create a new Y-search user by only plugging in the last 32
Markers of your 67 marker test .Set the limit to a genetic distance of 2
or 3.for
comparing To bad but not all R1B1C7's use Y-search. Or simply eyeball the

R1B1C7. Haplogroup they appear to be closer in genetic distance than other

haplogroups when comparing only the last 32 markers, for some reason.How
strange
is that?



I have done that. Compare 3VEJQ J8A43 JH4GZ XEDAQ vujw4

Some contain 67 marker sequence; some contain much less.

When I compare my nine markers to the nine markers of vujw4 I get a GD of

0.

When I compare my 67 markers against vuyw4, I get a GD of 15.

With only comparing a small number of markers, you can be assured of
matching up very well with someone who is a GD of 0 from you.

But expand to a large number of markers, and you "narrow the field" of
possibilities.

FOR EXAMPLE
Do a survey at the train station: Choose passengers awaiting train
arrival

Ask three questions:
Was your sixth grade teacher a woman?
Did you go to high school ?
Was your high school located West of the Mississippi?

You will find many matches.

Expand the query with more questions:

Did you take Physics in high school?
Were you in top 5% of class in grades at graduation?
Did you get a scholarship for college?
Do you now have a PhD ?

You will discover that the number of matches has reduced considerably.

The more objects selected for comparison results in a reduction of the
number of close matches.

If tomorrow FTDNA were to announce a 300 marker test for $67.95, and
thousands of us submitted samples in order to be tested and sequenced, we
would
discover that are very close cousins (who match 65 for 67) may drift away
to a
match of 268 for 300.













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