Stata tip 152: if and if: When to use the if qualifier and when to use the if command

Nicholas Cox and Clyde B. Schechter ()
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Clyde B. Schechter: Albert Einstein College of Medicine

Stata Journal, 2023, vol. 23, issue 2, 589-594

Date: 2023
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DOI: 10.1177/1536867X231175349

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