Re: [R] Value of 'pi'

From: MacQueen, Don <macqueen1_at_llnl.gov>
Date: Mon, 30 May 2011 21:38:18 -0700


I once knew someone who thought that a 1-sided upper 99% confidence limit for the mean with n=7 was calculated by multiplying the standard error of the mean by pi.

-Don

On 5/30/11 6:00 PM, "Bentley Coffey" <bentleygcoffey_at_gmail.com> wrote:

>Pi is an irRATIOnal number, meaning that it is not equal to the ratio of
>any
>integers ("whole numbers"). Hence, 22/7 is ONLY an approximation. The
>built-in value for pi in R is also just an approximation (pi has no
>terminal
>digit on the right of the decimal point so any finite number of digits
>will
>just be an approximation). Yet, the built-in value for pi in R is a more
>precise approximation, which is usually preferred...
>On May 30, 2011 2:02 AM, "Vincy Pyne" <vincy_pyne_at_yahoo.ca> wrote:
>> Dear R helpers,
>>
>> I have one basic doubt about the value of pi. In school, we have learned
>that
>>
>> pi = 22/7 (which is = 3.142857). However, if I type pi in R, I get pi =
>3.141593. So which value of pi should be considered?
>>
>> Regards
>>
>> Vincy
>>
>>
>>
>>
>>
>> [[alternative HTML version deleted]]
>>
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>
> [[alternative HTML version deleted]]
>
>______________________________________________
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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Tue 31 May 2011 - 04:41:41 GMT

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