[R] Three sigma rule

[David Winsemius]

On May 28, 2011, at 2:12 PM, Salil Sharma wrote:

> Dear Sir,
>
>
>
> I have data, coming from tests, consisting of 300 values. Is there a  
> way in
> R with which I can confirm this data to 68-95-99.8 rule or three- 
> sigma rule?

Can you describe this rule? I get the idea that it might be "private  
language" adopted by the SigxSigma sect.
>
> I need to look around percentile ranks and prediction intervals for  
> this
> data. I, however, used SixSigma package and used ss.ci() function,  
> which
> produced 95% confidence intervals. I still am not certain about  
> percentile
> ranks conforming to 68-95-99.7 rule for this data.

The quantile function is pretty much "standard operating procedure".

fivenum will return the values that would appear in a box-and-whiskers  
plot.


-- 
David Winsemius, MD
West Hartford, CT