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st: Equivalent of Excel's COUNTIF

From   "Teubner, David (Health)" <>
To   "" <>
Subject   st: Equivalent of Excel's COUNTIF
Date   Wed, 16 Nov 2011 07:17:43 +1030

Apologies for the slightly long-winded first post.

I have a data stet of emergency department presentations for the last 18 years.  The dataset includes numerous variables about individual patient presentations to the department, including time of arrival and time of leaving.  What it does not have is a variable for the number of patients already in the department when each new patient arrives.

It seems to me that I could construct this by simply subtracting the number of patients who have left (prior to the time of arrival of a new patient) from the number who have arrived.  I understand how to calculate the number who have arrived (sort by arrival time and use the _n function) but I don't understand how to do the left number.  In Excel I would use COUNTIF(-all arrival times-,<individual patients discharge time).  Is there a way to do this in Stata?

Thanks in advance

David Teubner
Senior Consultant,Emergency Department
Flinders Medical Centre 
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