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From |
"Nick Cox" <n.j.cox@durham.ac.uk> |

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

Subject |
RE: st: function to calculate frequencies |

Date |
Mon, 6 Oct 2008 11:36:19 +0100 |

On -count- see also SJ-7-4 dm0033 . . . . . . Speaking Stata: Counting groups, especially panels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox Q4/07 SJ 7(4):571--581 (no commands) discusses how to count panels through reduction commands or through tabulation commands and how to overcome problems that do not yield easily to these approaches SJ-7-1 pr0029 . . . . . . . . . . . . . . . Speaking Stata: Making it count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . N. J. Cox Q1/07 SJ 7(1):117--130 (no commands) discusses count used with a loop over observations or variables Nick n.j.cox@durham.ac.uk Maarten buis --- Javier Lázaro <javierlazaro9@gmail.com> wrote: > I am a beginner programmer of Stata, I am doing an ado file where I > need to calculate a determined frequency, but I can´t use the command > "tabulate" (it doesn´t give me exactly what I want). > For example, I would like to obtain the frequency for a variable of a > number that, perhaps, there aren´t any observation. ( I can´t achieve > it with tabulate, because it returns only the existing frequencies). If you want to allow for the possibility that a category is empty then you can't rely on the data to tell you which categories you should compute the frequencies over. So you will have to specify the categories. In that case -count- is the most basic command for computing frequencies, see the silly example below. Alternatively, you can take a look at Ben Jann's -fre- command, see -ssc describe fre-. *---------------- begin example ---------------- sysuse auto, clear foreach i in 0 1 300 { qui count if foreign == `i' di as text "`i' " as result r(N) } *----------------- end example ----------------- (For more on how to use examples I sent to the Statalist, see http://home.fsw.vu.nl/m.buis/stata/exampleFAQ.html ) * * 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: function to calculate frequencies***From:*"Javier Lázaro" <javierlazaro9@gmail.com>

**Re: st: function to calculate frequencies***From:*Maarten buis <maartenbuis@yahoo.co.uk>

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