[R] Inverse t-distribution(TINV function in Excel)

[Felipe Carrillo]

Thanks everyone for your help the qt function worked
like a dream. I ended up using it like this;
T <- qt((1-0.05/2),7) to estimate 95% intervals
divided by 2. 7 would be the number of days sampled.I
got the same result I get with Systat. 


> > I can't actually tell which function in R is the
> > equivalent to TINV function in Excel.
> > Anyone familiar with that function? Thanks
> 
> TINV is returns a half range t quantile function and
> it returns 0 from 1 
> and 5 million from 0;  =TINV(0.1,100) produces
> 1.6602348, so I think you 
> need to divide your arguments by 2 and subtract that
> from 1 to get the 
> same result with qt()
> 
> > qt(.95,100)
> [1] 1.660234
> > qt(.5,100)
> [1] 0
> 
> -- 
> David Winsemius
> 
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 Felipe D. Carrillo
  Fishery Biologist
  Department of the Interior
  US Fish & Wildlife Service
  California, USA