def inverse_fisher_z_transform(z):
 return (((e ** (2 * z)) - 1.0) / ((e ** (2 * z)) + 1.0))

def inverse_fisher_z_transform ( z ) : return ( ( ( e ** ( 2 * z ) ) - 1.0 ) / ( ( e ** ( 2 * z ) ) + 1.0 ) )
calculate the inverse of the fisher z transform on a z value .