R help - Aug 2006 - Calculating critical values

Hello,

 	I have an HLM-like situation: a data frame with rows representing
individuals, and columns representing some statistics for the individual
(e.g., a mean and variance for that individual, plus the number of
observations for that person).

 	I'm interested in computing a confidence interval around each
individual's mean, but to do that, I would need to know the critical t-value
for each individual.

 	Ergo, is there any sort of function that returns a critical t-value
for a given p/alpha and df?

Thanks,
Adam Kramer

Adam D. I. Kramer wrote:
> Hello,
> 
>  	I have an HLM-like situation: a data frame with rows representing
> individuals, and columns representing some statistics for the individual
> (e.g., a mean and variance for that individual, plus the number of
> observations for that person).
> 
>  	I'm interested in computing a confidence interval around each
> individual's mean, but to do that, I would need to know the critical
t-value
> for each individual.
> 
>  	Ergo, is there any sort of function that returns a critical t-value
> for a given p/alpha and df?
?qt

qt(p=.05, df=100)
[1] -1.66023
> Thanks,
> Adam Kramer
> 
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