# Thread: What do fst distances show?

1. ## What do fst distances show?

I'm new to this, what does fst distances show compared to oracle calculators etc? Thanks.

I'll be really grateful if someone could explain this to me because it's got me confused

2. WRT to Oracle admix calculators the lower the number the better. The tell you best fits.
dp :-)

3. ## The Following 4 Users Say Thank You to dp For This Useful Post:

AJL (12-12-2014),  Gray Fox (12-13-2014),  Scarlet Ibis (12-12-2014),  The Barnacle (12-12-2014)

4. Fst is fixation index, a measure of distance to populations. As David said, the closer you are to zero, the less the distance.

5. ## The Following 4 Users Say Thank You to AJL For This Useful Post:

dp (12-15-2014),  Gray Fox (12-13-2014),  Scarlet Ibis (12-12-2014),  The Barnacle (12-12-2014)

6. Originally Posted by AJL
Fst is fixation index, a measure of distance to populations. As David said, the closer you are to zero, the less the distance.
Great, however whats more accurate in terms of knowing who your closest population is to you? Fst distances or oracle? What do oracle show?

7. Originally Posted by David Powell
WRT to Oracle admix calculators the lower the number the better. The tell you best fits.
dp :-)
What do oracle shows?

8. It's not an exact science and results will vary in accuracy for individuals but that does not always mean any one system is inherently better than another. The best bet is to look at results from multiple tests and see what signals are repeated.

9. ## The Following 5 Users Say Thank You to AJL For This Useful Post:

Anglo-Celtic DC (01-03-2015),  ArmandoR1b (12-13-2014),  dp (12-15-2014),  Gray Fox (12-13-2014),  The Barnacle (12-13-2014)

10. at what number does the population distance lose it relevance?

11. If i have a repeated population at 30.00-25.00 distance does that make it very far away? and what percentage would that ethnicity amount up to?

12. 25+ is not significant. That sounds like an Oracle1 value (and one for a very admixed individual)
Use Oracle4 to get a population mix with lower Fst.
d[ :-)

13. ## The Following 2 Users Say Thank You to dp For This Useful Post:

AJL (01-11-2017),  Táltos (01-12-2017)

14. To expand on dp's excellent answer, 1.00 would be a perfect match on single mode. Most people of a single ethnic origin, from a non-diverse population that is well represented in data sets, will end up below 4.00 on single mode. 25.00 is a horrible match, and while you might by chance have a percentage of your ancestry from that or a similar population, it's not a good representation of your ancestry overall.

15. ## The Following 2 Users Say Thank You to AJL For This Useful Post:

dp (01-12-2017),  Táltos (01-12-2017)

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