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From |
"Josiane Georges" <jgeorges@health.nyc.gov> |

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

Subject |
st: RE: simple sum() question |

Date |
Wed, 15 Apr 2009 10:58:06 -0400 |

I use the collapse command when dealing with claims data structure much the way your clinic visit data is. I would suggest the following syntax: collapse (sum) clinic, by (patient_id) Josiane "Josie" Georges Sr. Planning Analyst Division of Mental Hygiene Tel: 212-219-5194 Fax: 212-219-5192 Email: jgeorges@health.nyc.gov -----Original Message----- From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Shehzad Ali Sent: Wednesday, April 15, 2009 10:48 AM To: statalist@hsphsun2.harvard.edu Cc: noman.paracha@gmail.com Subject: st: simple sum() question Hi, I have a simple question about summing across observations. I have 100 patients (variable: patient_id) in the dataset, each had clinic visits (variable: clinic) and hospital visits (variable: hospital) recorded at weeks 4, 8, 12 and 16. The dataset is long and hence I have 400 observations (one observation per patient per time point). I want to sum the clinic visits for each patient (across all 4 visits) bearing in mind that some patients had less than 4 visits. So effectively I want to generate a new variable that will produce the sum of clinic visits for each patient. Any help would be appreciated. Thank you, Shehzad * * 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/ * * 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: simple sum() question***From:*Shehzad Ali <sia500@york.ac.uk>

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