[R] Bug in predict.lm?

[Charles Berry]

Bert Gunter <gunter.berton <at> gene.com> writes:

> 
> Yes, I realize that it is more likely  a misunderstanding on my part.
> Suitable humility will be tendered if this is pointed out.
> 
> The claimed "bug" is that predict.lm throws an error when the scale
> argument is specified with interval = "conf" (and in some other
> cases):
> 
> > z <- lm(rnorm(10)~I(1:10))
> 
> > predict(z,int="conf",scale=1)
> Error in predict.lm(z, int = "conf", scale = 1) : object 'w' not found
> 
> R version 3.0.2 (2013-09-25)
> Platform: i386-w64-mingw32/i386 (32-bit)
> 
> Cheers,
> Bert
> 

I do not see this (see below). 

Maybe traceback() or options(recover=browser) to get
to the bottom??



> z <- lm(rnorm(10)~I(1:10))
> predict(z,int="conf",scale=1)
          fit        lwr       upr
1  0.02491723 -1.1270591 1.1768935
2  0.06402057 -0.9129873 1.0410284
3  0.10312392 -0.7185606 0.9248085
4  0.14222726 -0.5569958 0.8414504
5  0.18133060 -0.4477852 0.8104464
6  0.22043395 -0.4086818 0.8495497
7  0.25953729 -0.4396858 0.9587604
8  0.29864063 -0.5230439 1.1203252
9  0.33774398 -0.6392639 1.3147518
10 0.37684732 -0.7751290 1.5288236
> version
               _                           
platform       x86_64-apple-darwin10.8.0   
arch           x86_64                      
os             darwin10.8.0                
system         x86_64, darwin10.8.0        
status                                     
major          3                           
minor          0.2                         
year           2013                        
month          09                          
day            25                          
svn rev        63987                       
language       R                           
version.string R version 3.0.2 (2013-09-25)
nickname       Frisbee Sailing             
>