Thanks for that Ben, I appreciate it a lot.
I have another question if you don't mind taking the time to answer it. I
want to create a subset from dataset called "datafile5" with only the
variables "Date," "PM2.5 mean concentration," "SITE_LONGITUDE," and
"SITE_LATITUDE," dating only in September
Hi everyone,
I'm trying to categorize by month in R. How can I do this if my dates are in
date/month/year form?
Thanks,
Lois
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