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Copyright (C) 2000-2012 Philippe Troin <webmaster@fifi.org>.
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FISHER(x)
FISHER function returns the Fisher transformation at @x.
If @x is not-number FISHER returns #VALUE! error. If @x <= -1 or @x >= 1 FISHER returns #NUM! error.
This function is Excel compatible.
FISHER(0.332) equals 0.345074339.
SKEW.