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From |
"Michael Blasnik" <michael.blasnik@verizon.net> |

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

Subject |
st: Re: Counts of different values in one variable by another variable |

Date |
Thu, 25 Mar 2004 08:57:51 -0500 |

*flag each person just once bysort hhid persid: gen byte perperson=(_n==1) * calculate number of persons per household egen totpeople=sum(perperson), by(hhid) * flag each household once, to avoid duplicates in list commands bysort hhid: gen byte taghh=(_n==1) l hhid if taghh==1 & totpeople==1 l hhid if taghh==1 & totpeople==2 .. etc.. Michael Blasnik michael.blasnik@verizon.net ----- Original Message ----- From: "Donnell Butler" <djbutler@princeton.edu> To: <statalist@hsphsun2.harvard.edu> Sent: Thursday, March 25, 2004 6:10 AM Subject: st: Counts of different values in one variable by another variable > Good Day, > > I am trying to do something which I imagine must be easy to do in Stata, but > I can't find the solution in the manuals, help books, or FAQ online. > Clearly, I am not thinking clearly, because this seems like a simple > request. Perhaps, I just don't know how to phrase the question correctly in > my search for the answer. Nevertheless, I am hoping that someone can help or > direct me to an existing response that my answer my question with the > Statalist archive number or month/year. > > > Here is a simplified version of my dilemma: > > I have a data set with multiple id numbers. There are is always one > primary id (hhid), but sometimes there are more than one subsidiary ids > (persid). The persid is simply two digits more than the hhid. For example > hhid= 12345 and persid=1234501 (or in the cases where there is more than > one, persid=1234501, 1234502, 1234503, etc. The records are structured > such that for every action on a given date, there is a record. For > example: > > HHID PERSID ACTION DATE > 12345 1234501 EAT 1/1/2003 > 12345 1234501 DRINK 1/2/2003 > 12345 1234501 DRINK 1/3/2003 > 12345 1234501 BE MERRY 1/4/2003 > 12345 1234502 DRINK 1/1/2003 <-Note new person id, but same hhid > 12345 1234502 EAT 1/3/2003 > 12345 1234503 BE MERRY 1/2/2003 <-Note new person id, but same > hhid > 12346 1234601 BE MERRY 1/1/2003 <-Note new hhid > > ... and so on. > > So, here is my dilemma, I am trying to find a command or commands that > will do two things: > (1) For the entire data set, across all households, how many times are > there 1,2,3,...N numbers of unique PERSIDs within a household? That is, > how many households have 1,2,3,... N persons. > (2) Display the HHID for households that have X number of persons? That > is, for households with X number of unique PERSIDS within a household, > list the HHIDS. > > It seems so simple, but the count command can't count within variables. > The egen command can't work with by commands. Clearly, there is an obvious > answer but I can't seem to figure it out. Please help. > > Thanks, > Donnell > > Donnell Butler > Ph.D. Candidate > Princeton University > 125 Wallace Hall > Princeton, NJ 08540 > 609-419-1311 * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**References**:**st: Counts of different values in one variable by another variable***From:*"Donnell Butler" <djbutler@princeton.edu>

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