The count() function in the plyr package works beautifully. Thanks to Jim,
Rainer and Dennis for your help.
Best.
-Original Message-
From: Dennis Murphy [mailto:djmu...@gmail.com]
Sent: Monday, October 24, 2011 12:05 PM
To: asindc
Cc: r-help@r-project.org
Subject: Re: [R] How to selecti
Sorry, I attempted to paste the sample data but it must have been stripped
out when I posted. It is hopefully now listed below.
tapply looks useful. I will check it out further.
Here's the sample data:
> flights[1:10,]
PASSENGERS DISTANCE ORIGIN ORIGIN_CITY_NAME ORIGIN_WAC DEST
DEST_CITY_NA
2 matches
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