Difference between revisions of "User:Regina"

Revision as of 17:07, 29 December 2008

Test Wiki-markup here

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 [[/MyDrafts]]
-=== FISHER and FISHERINV===
-Reduced accuracy for r -> 0
-Needs log1p for improvement.
-/2*log((1+r)/(1-r)) = 1/2*log(1+2*r/(1-r)) = 1/2* log1p(2r/(1-p))
-or
-/2*(log(1+r)-log(1-r)) = 1/2*( log1p(r)-log1p(-r))
-Have to test it.
-:Test done. Accuracy is the same. But all have additional problem for r -> 1. Seems to be the known problem with 1-r.
-Achtung: Fisher(r) = arctanh(r). Letztere hat das gleiche Problem für r -> 0.
-Same problem in FISHERINV with (exp(2r)-1)/(exp(2r)+1)
-Achtung FISHERINV(r)=tanh(r)
-: tanh ist compiler core function in math.h
 == Sandbox ==