afni.nimh.nih.gov

Hi Hema,

The hyperbolic arctangent function (atanh(x)) is
the Fisher transformation. You can use that in
3dcalc, 1deval or ccalc for volumetric, single
time series, or single value data, respectively.

For example:

1deval -a r_values.1D -expr 'atanh(a)' > fisher_z_values.1D

or

set r = 0.7
ccalc "atanh($r)"

- rick