[R] Translation of R code required

[Sarah Goslee]

On 11/3/06, Barry Rowlingson <B.Rowlingson at lancaster.ac.uk> wrote:

>   How do you know that step works? If the dataframe 'mental' doesnt have
> an 'Rx' column then mental$Rx will be 'NULL', and the factor() function
> will make a factor out of that...

Good point. I rarely use factors and missed that one.

Happily, my inaccurate solution turned out to solve the problem anyway.

Sarah

-- 
Sarah Goslee
http://www.functionaldiversity.org