search for: datefirsteven

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Did you mean: datefirstevent
2007 Jul 25
1
if - else
Greetings, I have some confusion with the use of if - else. Let's say I have a four variables as follows: Condition DateFound DateFirstEvent DateSecondEvent NA 10Jan2000 NA NA 0 05Jan2000 07Jan2000 10Jan2000 1 07Jan2000 07Jan2000 08Jan2000 2 09Jan2000 NA...