Re: pvalues from t-distribution

[Sundar Dorai-Raj <sundar.dorai-raj@PDF.COM>]

Ela,

Sliwerska, Ela wrote:

> Hi all!
> I am trying to convert my tscore column into pvalues. I use
> 2*(1-pnorm(abs(tscore))) command from command window but it works for
> particular value. I would like to transfer my column all at once. Can
> someone help? Thanks!
> Ela
(Please use an informative subject line.)

If "tscore" is part of a data.frame (say, "DF") then you should do the 
following:
2 * (1 - pnorm(abs(DF$tscore)))

But why not use a t-distribution rather than a Z-distribution? What are 
the distributional assumptions of "tscore"? If you know the degrees of 
freedom then using the following may be more appropriate:
2 * (1 - pt(abs(DF$tscore), degrees.of.freedom))

Hope this helps,

Sundar