See
?ftable
?as.data.frame
?xtabs
e.g.
ftable( xtabs( ~code+year+month, your.df ), col.vars=1 )
as.data.frame( xtabs(~code+year+month, your.df ) )
HTH,
Chuck
On Tue, 23 Sep 2008, Hutchinson,David [PYR] wrote:
Hi R-Users,
I have a data frame containing year, month, day, and code columns. The
code column is a unique character of set ('E','A','B') - I am trying to
determine an efficient way of summarizing the count of each of these
codes by month and year without having to use for...loops and subsets.
Does anyone have any suggestions?
Thanks in advance,
Dave
Here is a snapshot of my data frame:
year month day code
8006 1935 12 1 E
8007 1935 12 2
8008 1935 12 3 E
8009 1935 12 4
8010 1935 12 5 E
8011 1935 12 6 E
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Charles C. Berry (858) 534-2098
Dept of Family/Preventive Medicine
E mailto:[EMAIL PROTECTED] UC San Diego
http://famprevmed.ucsd.edu/faculty/cberry/ La Jolla, San Diego 92093-0901
______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
