[R] Two quick questions

Serguei Kaniovski kaniovsk at wsr.ac.at
Fri Mar 3 08:21:27 CET 2006

Hi all,

1. How to construct a date from three variables year, month, and day,
where all three are integers?

2. I have a dataframe by date and sector. I would like to add-up all
entries for all variable with identical date and sector, replacing the
original entries, i.e. emulate the STATA command "collapse (sum) var1
var2 var3, by(date sector)".

Thank you,
Serguei Kaniovski

More information about the R-help mailing list