Top Questions

1. Difference in months between dates with different rows (same identifier) (in R)
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2. Take differences between dates within id over a sequence (different rows) in R
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3. Removing observations conditionally (after use of MatchIt package) in R
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   3 answers
4. How to create dummy that equals 1 (and 0 otherwise) if an id appears only once? (in R)
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