[R] Why can't Anove (car package) see the data?

Patrick Connolly p.connolly at hortresearch.co.nz
Wed Aug 14 05:14:02 CEST 2002

At the end of the 'Details:' section of the help on Anova (car
package), it states:

     The standard R `anova' function calculates sequential (type-I)
     tests. These rarely test meaningful hypotheses.

So I thought I'd try it.  However, I was perplexed to get this

Browse[1]> Anova.glm(leaf.glm1, type ="II")
Error in terms.formula(formula, data = data) : 
	Object "use.df" not found

The regular anova function can find use.df.  What could make it
invisible to Anova?  I thought it might be because terms.formula took
an argument x and I already had an object x, but changing its name
didn't help.  I spent some time searching the archives but found no
mention of this problem.  I read some of the car package help files,
but didn't notice a reference to what is different in the way data is

The example given in the help file does work, but it uses a data
object which is in the working directory.  That's not practicable
within a function.  So I'd appreciate other ideas.

platform i686-pc-linux-gnu
arch     i686             
os       linux-gnu        
system   i686, linux-gnu  
major    1                
minor    5.1              
year     2002             
month    06               
day      17               
language R                


Patrick Connolly
Mt Albert
New Zealand 
Ph: +64-9 815 4200 x 7188
I have the world`s largest collection of seashells. I keep it on all
the beaches of the world ... Perhaps you`ve seen it.  ---Steven Wright 

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