On Sun, Feb 15, 2009 at 7:44 PM, Sally <sagoldes@shaw.ca> wrote:

> I have done alot of reading on multiple testing but I don't recall reading
> what the cut-off for FDR?  In other words how many tests can you run before
> you need an FDR?
>

As soon as you run more than one test, you need to correct for multiple
testing.  An FDR is one alternative for correcting for multiple testing.
There are several others.  For examples, see the help for p.adjust().

Hope that helps.

Sean

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