[R] how to count occurrences of string?

w_poet stephen.le at ucla.edu
Sun Sep 20 17:58:08 CEST 2009

Hi everyone,

I have an array with a variable called comments. I wish to count the number
of subjects whose post-experiment comments contain a string x and then cross
tab this with other variables of interest, ex. age. Does anyone have any
suggestions on how to count unique occurrences of a string embedded within a
variable and cross-tab it with other variables?

I've looked through the help files, etc. One method I tried was to use
strsplit to split comments. I can use this with table to count the number of
occurrences of x, but I can't cross tab this with other variables because
comments is a ragged array after being split.

Thanks in advance,

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