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standard error reported by gnu

Posted By: rambiz
Date: Thursday, 8 December 2016, at 11:44 a.m.

In Response To: standard error reported by gnu (Tom Keith)

I am getting back to this problem because of some recent stuff, I'm involved in.

1) Should't the joint standard deviation rather be:
JSD=sqrt(SD1^2+SD2^2-2*COV) ?
Where COV is the covariance of the outcomes of the two plays in question.

2) Since all backgammon games end in a race, I think that the covariance is almost always a positive number? Does everybody agree?

3) Can you come up with a position, where the outcomes of two plays have a negative covariance (same dice sequence for both plays, of course)?

Messages In This Thread

• standard error reported by gnu
  rambiz -- Thursday, 3 February 2011, at 10:11 p.m.
  • standard error reported by gnu
    Tom Keith -- Friday, 4 February 2011, at 3:30 a.m.
    • standard error reported by gnu
      rambiz -- Friday, 4 February 2011, at 9:32 p.m.