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From |
Tim Evans <Tim.Evans@wmciu.nhs.uk> |

To |
"'statalist@hsphsun2.harvard.edu'" <statalist@hsphsun2.harvard.edu> |

Subject |
RE: st: Integer values in Stata |

Date |
Thu, 1 Sep 2011 11:23:07 +0100 |

Thanks Nick all worked a treat. Best wishes Tim -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Nick Cox Sent: 01 September 2011 11:17 To: statalist@hsphsun2.harvard.edu Subject: Re: st: Integer values in Stata There are naturally other ways to do it. Another is . keep if mod(end, 1) == 0 or . keep if !mod(end,1) Nick On Thu, Sep 1, 2011 at 11:10 AM, Nick Cox <njcoxstata@gmail.com> wrote: > -int(end)- is not a true or false test of whether its argument is > integer. Rather it rounds towards zero, and the result is an integer: > if that result is non-zero if it is treated as true. That explains why > you got what you did. > > keep if end == int(end) > > is one way of selecting integers as values that are already integers > are unchanged by the function. > > A similar example is already included in my talk for the London users' > meeting on functions. > > Nick > > On Thu, Sep 1, 2011 at 11:02 AM, Tim Evans <Tim.Evans@wmciu.nhs.uk> wrote: > >> I have a list of values in a column in Stata like so: >> >> end >> .2 >> .4 >> .6 >> .8 >> 1 >> 1.2 >> 1.4 >> 1.6 >> 1.8 >> 2 >> 2.2 >> 2.4 >> 2.6 >> 2.8 >> 3 >> 3.2 >> 3.4 >> 3.6 >> 3.8 >> 4 >> 4.2 >> 4.4 >> 4.6 >> 4.8 >> 5 >> >> and I wish to only keep the whole number value i.e. 1,2,3,4,5 etc. and drop any non integer values. I there use the following code >> >> keep if int(end) >> >> however, I still end up with the following values >> >> end >> 1 >> 1.2 >> 1.4 >> 1.6 >> 1.8 >> 2 >> 2.2 >> 2.4 >> 2.6 >> 2.8 >> 3 >> 3.2 >> 3.4 >> 3.6 >> 3.8 >> 4 >> 4.2 >> 4.4 >> 4.6 >> 4.8 >> 5 >> How do I ensure I only keep the whole numbers? Using the following would not be ideal (keep if inlist(end, 1,2,3,4,5)) as I may have a much longer list. > * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/ _DISCLAIMER: This email and any attachments hereto contains proprietary information, some or all of which may be confidential or legally privileged. It is for the exclusive use of the intended recipient(s) only. If an addressing or transmission error has misdirected this e-mail and you are not the intended recipient(s), please notify the author by replying to this e-mail. If you are not the intended recipient you must not use, disclose, distribute, copy, print, or rely on this e-mail or any attachments, as this may be unlawful. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**Re: st: Polynomial Fitting and RD Design***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: Polynomial Fitting and RD Design***From:*Maarten Buis <maartenlbuis@gmail.com>

**Re: st: Polynomial Fitting and RD Design***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: Polynomial Fitting and RD Design***From:*Maarten Buis <maartenlbuis@gmail.com>

**st: Integer values in Stata***From:*Tim Evans <Tim.Evans@wmciu.nhs.uk>

**Re: st: Integer values in Stata***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: Integer values in Stata***From:*Nick Cox <njcoxstata@gmail.com>

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