On Thu, 29 Nov 2001 14:37:14 -0400, Gus Gassmann <[EMAIL PROTECTED]> wrote:
> Rich Ulrich wrote: > > > On Thu, 29 Nov 2001 15:48:48 +0300, Ludovic Duponchel > > <[EMAIL PROTECTED]> wrote: > > > > > If x values have a normal distribution, is there a normal distribution > > > for x^2 ? > > > > If z is standard normal [ that is, mean 0, variance 1.0 ] > > then z^2 is chi squared with 1 degree of freedom. > > > > And the sum of S independent z variates > > is chi squared with S degrees of freedom. > > Hold it! The sum of S independent z variates is normal. > The sum of the _squares_ of S independent z variates is > chi squared with S degrees of freedom. > > (But I am sure you knew that.) oops- make that < z^2 > for < z > of course - -- Rich Ulrich, [EMAIL PROTECTED] http://www.pitt.edu/~wpilib/index.html ================================================================= Instructions for joining and leaving this list and remarks about the problem of INAPPROPRIATE MESSAGES are available at http://jse.stat.ncsu.edu/ =================================================================
