R help - Oct 2011 - error messages

Im doing a project using Rcommander. I have a dataset with 5 variables, BMI
being one of them. I would like to find the variance, standard deviation, range,
median, etc of BMI. However, everytime I type a command into the script window,
(such as var(BMI$BMI,na.rm=TRUE) )an error message pops up saying Object
"BMI" not found. I can graph it, work it, do t-test, etc,. It's
listed as one of the variables in the data set. So I don't understand why it
cant find BMI. Thanks

Joyce Flynt <dr.joyceflynt <at> yahoo.com> writes:
> 
> Im doing a project using Rcommander. I have a dataset with 5 variables, 
> BMI being one of them. I would like to
> find the variance, standard deviation, range, median, etc of BMI. 
> However, everytime I type a command
> into the script window, (such as var(BMI$BMI,na.rm=TRUE) )
> an error message pops up saying Object "BMI"
> not found. I can graph it, work it, do t-test, etc,.
>  It's listed as one of the variables in the data set.
>  So I don't understand why it cant find BMI. Thanks

 It's hard to solve without a *reproducible* example.
Is your data set really called 'BMI'?  (i.e. should you
be saying BMI$BMI, or just BMI (if your data frame is
attached), or mydata$BMI? If your data set *is* called
BMI, does it make a difference if you rename it to e.g. BMIdat?

  What are the results of

ls()

?