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From |
Anthony Khawaja <anthonykhawaja@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
st: egen cut - how to force a category even if zero observations |

Date |
Wed, 26 Feb 2014 16:38:57 -0800 (PST) |

Is it possible to force the "egen cut" command to keep a specified category even though there are zero observations within that category. For example, I want to write a script that will work on multiple different datasets, and I want to categorise age into <40, >=40 <50, >=50 <60, >=60 <70, >=70 <80, >=80 <90, >=90. The egen cut command works well unless I have zero observation in a category - rather than still creating that as a level of the new categorical variable, Stata just doesn't form the category. This would usually be fine, but I am using "file write" commands from which I want to produce identically shaped tab delimited files to easily overlay numbers from multiple studies. I have searched extensively but not found a simple solution. Of course I could manually create the new variable, level by level. But I have many such variables, and this would be time consuming (and lack elegance!). Does anyone know of an elegant solution? For example, in one dataset, there are no participants <40 years. So the following command yields one less level in the categorical variable produced than I wanted: . egen agecut = cut(age), at (0 40 50 60 70 80 90 130) label . tab agecut agecut | Freq. Percent Cum. ------------+----------------------------------- 40- | 29 0.39 0.39 50- | 873 11.73 12.12 60- | 3,540 47.56 59.67 70- | 2,364 31.76 91.43 80- | 629 8.45 99.88 90- | 9 0.12 100.00 ------------+----------------------------------- Total | 7,444 100.00 Many thanks in advance for any advice. Anthony -- View this message in context: http://statalist.1588530.n2.nabble.com/egen-cut-how-to-force-a-category-even-if-zero-observations-tp7580488.html Sent from the Statalist mailing list archive at Nabble.com. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**Re: st: egen cut - how to force a category even if zero observations***From:*Nick Cox <njcoxstata@gmail.com>

**Re: st: egen cut - how to force a category even if zero observations***From:*Sergiy Radyakin <serjradyakin@gmail.com>

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