[R] IF STATEMENTS

Godmar Back godmar at gmail.com
Fri Jul 10 22:12:04 CEST 2009


It thinks twoSided is a variable, but you've never assigned such a variable.
Use "twoSided" instead - that's a string constant.

On Fri, Jul 10, 2009 at 4:04 PM, Mary A. Marion<mmstat at comcast.net> 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)
>
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