[R] Increase Decimal Accuracy?

Fri Mar 3 00:02:56 CET 2006

Ann Hess wrote:
> Is there any way to increase the decimal accuracy for probability 
> distributions.  For example (in R):
> 
>> 1-pchisq(90,5)
> [1] 0
> 
> But in Maple, I find that the value is 0.67193x10-17.

Look at this:

 > 1-pchisq(90,5)
[1] 0
 > pchisq(90,5, lower=FALSE)
[1] 6.71932e-18

Kjetil

> 
> I need to compare some really small p-values...is there a way to increase 
> the decimal place accuracy beyond 1x10-16 (which seems to be the limit)?
> 
> Any help would be appreciated.
> 
> Ann
> 
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