See also ?switch (where quotes are _not_ required). Bert Gunter Genentech Nonclinical Biostatistics
-----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Dimitris Rizopoulos Sent: Friday, July 10, 2009 1:15 PM To: Mary A. Marion Cc: r-help@r-project.org Subject: Re: [R] IF STATEMENTS you just need to use quotes, e.g., if (type == "Lower") { tL <- -9999 tU <- qt(1-alpha,n-1) } and so on. I hope it helps. Best, Dimitris Mary A. Marion wrote: > Hello, > > I am working on using if statements. What is the error message telling > me here and how do I correct for it? > I have tried various combinations of quotes. > > Thank you. > Sincerely, > Mary A. Marion > > > #Find critical values > crit<-function(n,alpha,type) > { > if (type==twoSided) > { > alpha2=alpha/2 > tL<-qt(alpha2,n-1) > tU<-qt(1-alpha2,n-1) > } > if (type==Lower) > { > tL<- -9999 > tU<-qt(1-alpha,n-1) > } > if (type==Upper) { > tL<-qt(alpha,n-1) > tU<- 9999 > } > criticalValues<-c(tL,tU) > round(criticalValues,3) > } > crit(n=50,alpha=.05,type=twoSided) > Error in crit(n = 50, alpha = 0.05, type = twoSided) : > object 'twoSided' not found > > > crit(n=50,alpha=.05,type=Lower) > crit(n=50,alpha=.05,type=Upper) > > ______________________________________________ > 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. > -- Dimitris Rizopoulos Assistant Professor Department of Biostatistics Erasmus University Medical Center Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands Tel: +31/(0)10/7043478 Fax: +31/(0)10/7043014 ______________________________________________ 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. ______________________________________________ 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.