inverse values for the F distribution

[Rajarshi Guha]

Hello,
  I see in the manual and source that there are no functions to get
values for the inverse F distribution? Is there any reason why these
functions dont exist? In the abscence of this function is there any way
to get a critical value for an F test statistic?

Thanks,

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Rajarshi Guha <rajarshi@presidency.com> <http://jijo.cjb.net>
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