Hello Eric,
strptime("201206",format="%Y%m") gives NA (I don't know why but I'm a
newbie).
The only solution I found is to add "01" as a day to have a complete date
(Year Month Day):
x$Period<-as.Date(paste(x$Period,"01",sep=""),format="%Y%m%d")
Then you get a Date format you can use to plot graph.
I think you will get better solutions from advanced users.
Have a good day,
Ptit Bleu.
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