Hi,I am using the amazing package 'plyr". I have one problem. I would
appreciate help to fix the following error: Thanks.
______________________________
> library(plyr)
> data(baseball)
> summarise(baseball,
+ duration = max(year) - min(year),
+ nteams = length(unique(team)))
Error: could not find function "summarise"
> ddply(baseball, "id", summarise,
+ duration = max(year) - min(year),
+ nteams = length(unique(team)))
Error in llply(.data = .data, .fun = .fun, ..., .progress = .progress) :
object "summarise" not found
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Professor of Family Medicine
Boston University
Tel: 617-414-6221, Fax:617-414-3345
emails: chett...@gmail.com,vche...@bu.edu
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