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### z.transform.R (2004-01-15)
###
### Variance-Stabilizing Transformations of the Correlation Coefficient
###
###
### Copyright 2003-04 Korbinian Strimmer
###
### This file is part of the `GeneNet' library for R and related languages.
### It is made available under the terms of the GNU General Public
### License, version 3, or at your option, any later version,
### incorporated herein by reference.
###
### This program is distributed in the hope that it will be
### useful, but WITHOUT ANY WARRANTY; without even the implied
### warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
### PURPOSE. See the GNU General Public License for more
### details.
###
### You should have received a copy of the GNU General Public
### License along with this program; if not, write to the Free
### Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
### MA 02111-1307, USA
# Fisher's z-transform
z.transform = function(r)
{
return( atanh(r) )
}
# Hotelling's second-order transform
hotelling.transform = function(r, kappa)
{
z = z.transform(r)
return( z - (3*z+r)/(4*kappa) )
}
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