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From |
Philip Ryan <philip.ryan@adelaide.edu.au> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: Problem with replace if - test condition works only for some values of test variable |

Date |
Fri, 24 Oct 2008 09:24:07 +1030 |

Phil At 09:02 AM 24/10/2008, you wrote:

Please, indulge me. I'm sure I've overlooked something basic, but replace if is working only for certain values of the test variable and not for others. Start with any dataset open Here is the code fragment that replicates my problem: ge y=. generate x= (_n/100)-0.01 in 1/101 replace y=1 if x==0 replace y=1 if x==.01 replace y=1 if x==.25 replace y=1 if x==.26 replace y=1 if x==.5 replace y=1 if x==.51 replace y=1 if x==.75 replace y=1 if x==.76 replace y=1 if x==1 replace y=1 if x==.99 I'm able to make assignments to y only when x equals 0, .25, .5, .75, and 1 but for no other value. This is the output I get: . replace y=1 if x==.5 (1 real change made) . replace y=1 if x==.51 (0 real changes made) Why does this happen and how do I fix it? x is a float, so it should have enough precision for the test condition. And if the test can recognize .25 it should be able to recognize .26. Thanks N * * 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/

Philip Ryan Professor, Discipline of Public Health Director, Data Management & Analysis Centre University of Adelaide * * 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**:**st: Problem with replace if - test condition works only for some values of test variable***From:*"Naunihal Singh" <naunihal@post.harvard.edu>

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