Hello everyone.

I am very much a beginner with R and I am trying to turn the following if-then statement into R code. More detail. I want to create a new variable: "inperiod" that will be a numeric code. So if a specific event start date (StartDate) is greater or equal to a testing date (Beg1Date) AND the event end date (EndDate) is less than or equal to the testing date (Beg1Date), I want the inperiod code to be 1. I will do this for a range of dates so that the code can be anywhere from 1-25. 

If StartDate >= Beg1Date & EndDate <= Beg1Date inperiod = 1. 

Thanks for any help.

Zeda
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