Hi, Not sure why you wanted to separate A and B for a two sample t-test. dat1<-read.table(text=" weights company 1 A 2 A 2 B 3 B ",sep="",header=TRUE,stringsAsFactors=FALSE) t.test(weights~company,data=dat1)
# Welch Two Sample t-test # #data: weights by company #t = -1.4142, df = 2, p-value = 0.2929 #alternative hypothesis: true difference in means is not equal to 0 #95 percent confidence interval: #-4.042435 2.042435 #sample estimates: #mean in group A mean in group B # 1.5 2.5 In case, you wanted to separate A and B: library(reshape2) dcast(dat1,weights~company,value.var="weights") # weights A B #1 1 1 NA #2 2 2 2 #3 3 NA 3 Hope it helps. A.K. ----- Original Message ----- From: nilsonern <[email protected]> To: [email protected] Cc: Sent: Wednesday, November 14, 2012 11:52 PM Subject: [R] Importing Data for a two sample t-test I am trying to do a two sample t-test with data that i received in a text document. one list has the slab weights and the second has the company it is associated with. here is an example. weights company 1 A 2 A 2 B 3 B I was able to import the data but i cannot figure out how separate the data. I want to put them in two separate sets, one being A and one being B. Any help would be appreciated. Thanks. -- View this message in context: http://r.789695.n4.nabble.com/Importing-Data-for-a-two-sample-t-test-tp4649565.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ [email protected] 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. ______________________________________________ [email protected] 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.
