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st: Select a particular test

From   "Peci, Adriana (OAHPP)" <>
To   <>
Subject   st: Select a particular test
Date   Thu, 23 Feb 2012 17:57:05 -0500

Dear Stata list,

I have a long form database in which each patient identified by pat_id
have up to four tests performed. 
The test names are:IFA, DFA, CULT, BIN.
I want to select/know how many patients had IFA but not DFA, CULT, or

Here is an improvise of my data:

Pat_id    Test
1         IFA
1         DFA
1         CULT
1         BIN
2         BIN
2         IFA
2         DFA
3         IFA
4         DFA
4         CULT
4         CULT

Could someone help me with that ?

Thank you so much, 

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