[S] Noncentrality Parameter in pf()

Teo, Aimee L (aimee.l.teo@intel.com)
Mon, 12 Oct 1998 08:57:00 -0700


Hi,

I'm trying to do a power calculation using the pf() function (F
distribution),
and want to calculate a non-centrality parameter for varying contrast
levels.

The Splus help was not very helpful, first referring me to the help for
Chisquare, and then referring me to Posten's article on "An Effective
Algorithm
for the Noncentral Chi-Squared Distribution Function," which did include an
algorithm for calculating the non-centrality parameter for the pchisq()
function, but nothing for pf().

If anyone can help me out, that would be great. Thanks,
Aimee

---------------------------------------------------------
Aimee L. Teo
Statistician, Factory Support Services

Intel Corporation tel:(408)653-5828
2200 Mission College Blvd. fax:(408)765-8288
Santa Clara, CA 95052 email: aimee.l.teo@intel.com
---------------------------------------------------------

-----------------------------------------------------------------------
This message was distributed by s-news@wubios.wustl.edu. To unsubscribe
send e-mail to s-news-request@wubios.wustl.edu with the BODY of the
message: unsubscribe s-news