[R] DOE support in R and fac.design

[Nirmal Govind]

Thanks for your reply Prof. Ripley.

> It is very easy to change the levels of a factor by levels<-(): see its 
> help page.

Great.. thanks.

> charge-coupled device?  Probably central composite design -- not that I 
> know of.

Yes, I meant central composite design ...

> conf.design was ported from S, which does have fac.design.

I see... it may be helpful if this is mentioned next to fac.design so 
that the user doesn't go searching for it in R...

Thanks,
nirmal