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When the program is run with prior population information, the
printout is a bit different. Here I have run the same data with
, USEPOPINFO=1, and GENSBACK = 1:
Label (%Miss) Pop :
1 17 (0) 2 : 0.998 | Pop 1: 0.000 0.001 | Pop 3: 0.000 0.000
2 1219 (7) 2 : 1.000 | Pop 1: 0.000 0.000 | Pop 3: 0.000 0.000
3 1223 (0) 2 : 0.612 | Pop 1: 0.000 0.000 | Pop 3: 0.004 0.383
4 1329 (7) 1 : 1.000 | Pop 2: 0.000 0.000 | Pop 3: 0.000 0.000
5 15 (0) 3 : 0.999 | Pop 1: 0.000 0.001 | Pop 2: 0.000 0.000
In general, the first column of results (following ``Pop : '') shows
the posterior probability that the individual in question is correctly
assigned to the given population. The subsequent columns show the
probabilities that it is from, or has ancestry in, the other
populations. There are GENSBACK+1 entries for each of the other
populations, showing the probability that an individual is from that
population, has a parent, grandparent, great-granparent,... etc, from
that population (in this order).
For example, reading from row 3: Individual 1223 (who has 0% missing
data) is actually from the presumed population (2) with probability
0.612. There is (approximately) zero posterior probability that this
individual has recent ancestry in population 1, but it may have recent
ancestry in population 3 (the probabilities are 0.004, and 0.383, that
the individual is from population 3, or has a single
parent from population 3, respectively).
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Jonathan Pritchard
2003-07-10