User:Regina

native language

German

active in project

de, qa. sc

OOo user name

regina

special interest

www.ooowiki.de

Anleitung

ToDo

Working on functions sides

Statistical functions

Functions listed alphabetically, Functions listed by category

Planning Wiki-Pages

/MyDrafts

FISHER and FISHERINV

Reduced accuracy for r -> 0

Needs log1p for improvement.

1/2*log((1+r)/(1-r)) = 1/2*log(1+2*r/(1-r)) = 1/2* log1p(2r/(1-p))

or

1/2*(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

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