Dear all, I would like to convert the first column of a dataframe to a date (original format: year (4 digits) and month (last 2 digits))
>str(dat_FF) 'data.frame': 1022 obs. of 4 variables: $ date : int 192607 192608 192609 192610 192611 192612 192701 192702 192703 192704 ... $ Rm.Rf: num 2.69 2.52 0 -3.06 2.42 2.66 0 4.29 0.51 0.57 ... $ SMB : num -2.49 -1.25 -1.38 -0.2 -0.34 -0.07 -0.11 0.35 -1.87 0.44 ... $ HML : num -2.91 4.25 0.22 0.71 -0.4 -0.11 4.92 3.17 -2.92 1.33 ... But >dat_FF$date <- as.Date(as.character(dat_FF$date), format="%Y%m") delievers NAs: >str(dat_FF) 'data.frame': 1022 obs. of 4 variables: $ date : Date, format: NA NA ... I am very grateful for hints! Thanks in advance! Best, Martin ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
