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Inrange/Inlist
Can be used with dates. Say you want to restrict your dataset to beneficiaries who were discharges between Jan 1, 2007 and Sep 30, 2007.
keep if inrange(dschrgdt,date("01/01/2007","MDY"),date("09/30/2007","MDY"))
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Identifying Unique Observations
Context: multi-level data. For example, you have a patient-level dataset but want to know how many hospitals performed a certain kind of operation by volume quintile.
The easier method is to:
ssc inst unique /* downloads unique command */ cap drop temp_hospvols /* drop this variable prior to generation */ unique hospid4merge, by(op_1 cat5hospvol) gen(temp_hospvol) drop temp_hospvols
Alternatives include running codebook with different levels of restrictions in a loop.
forval op = 500(100)(700){ forval vq = 1/5{ codebook hospid4merge if op_1 == `op' & cat5hospvol == `vq' } // closes volume quintile loop } // closes operative code loop
For more information see also http://bit.ly/1fl6MJs
STATA cmd of the day: "set trace on"
"set trace on" shows you all the background code (in significant detail). At a low level (me) this is mostly useful if you need to figure out where you went wrong in a complicated series of loops. Â Without using this command you often have to start at the beginning, take out individual blocks of code from your loop and test-run them to diagnose the issue. Â TRACE at least puts you in the right ball park most of the time.
