Hi All, I've been having a little trouble with creating a loop that will run a a series of t.tests for inspection, Below is the code i've tried, and some checks i've looked at.
I've used the get(paste()) idea as i was told previously that the use of the eval should try and be avoided. I've run a single syntax to check that my systax is correct and works without any problems > t.test(channel.data.train$News~channel.data.train$power) Can anyone offer any advice? Many thanks Mike > str(channel.data.train$power) num [1:9913] 0 0 0 0 0 0 0 0 0 0 ... > summary(channel.data.train$power) Min. 1st Qu. Median Mean 3rd Qu. Max. 0.0000 0.0000 0.0000 0.2368 0.0000 1.0000 > names(channel.data.train) [1] "News" "Entertainment" "Communicate" [4] "Lifestyle" "Games" "Music" [7] "Money" "Celebrity" "Shopping" [10] "Sport" "Film" "Travel" [13] "Cars" "Property" "Chat" [16] "Bet.Play.Win" "config" "exposed" [19] "site" "referrer" "started" [22] "last_viewed" "num_views" "secs_since_viewed" [25] "register" "secs.na" "power" [28] "tt" > for(i in names(channel.data.train[,c(1:16)])){ + t.test(get(paste("channel.data.train$",i,"~channel.data.train$power",sep=""))) + } Error in get(paste("channel.data.train$", i, "~channel.data.train$power", : variable "channel.data.train$News~channel.data.train$power" was not found -- Michael Pearmain Senior Analytics Research Specialist Google UK Ltd Belgrave House 76 Buckingham Palace Road London SW1W 9TQ United Kingdom t +44 (0) 2032191684 mpearm...@google.com If you received this communication by mistake, please don't forward it to anyone else (it may contain confidential or privileged information), please erase all copies of it, including all attachments, and please let the sender know it went to the wrong person. Thanks. [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.