R help - Aug 2012 - Problem with segmented function

Hi,

I appreciate your help with the segmented function. I am relatively new to
R. I followed the introduction of the 'segmented'-package by Vito
Muggeo,
but still it does not work.
Here are the lines I wrote:

data_test<-data.frame(x=c(1:10),y=c(1,1,1,1,1,2,3,4,5,6))
lr_test<-lm(y~x,data_test)
seg_test<-segmented(lr_test,seg.Z~x,psi=1)


/error in segmented.lm(lr_test, seg.Z ~ x, psi = 1) : 
 A wrong number of terms in `seg.Z' or `psi'/

Thank you very much,
Stella



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Hi
> 
> Hi,
> 
> I appreciate your help with the segmented function. I am relatively new 
to
> R. I followed the introduction of the 'segmented'-package by Vito 
Muggeo,
> but still it does not work.
> Here are the lines I wrote:
> 
> data_test<-data.frame(x=c(1:10),y=c(1,1,1,1,1,2,3,4,5,6))
> lr_test<-lm(y~x,data_test)
> seg_test<-segmented(lr_test,seg.Z~x,psi=1)
You did not read help page correctly. seg.Z is named parameter in which 
you specify formula without LHS. psi shall be x near the expected slope 
change.

seg_test<-segmented(lr_test,seg.Z=~x,psi=5)

works corretly

Regards
Petr
> 
> 
> /error in segmented.lm(lr_test, seg.Z ~ x, psi = 1) : 
>  A wrong number of terms in `seg.Z' or `psi'/
> 
> Thank you very much,
> Stella
> 
> 
> 
> --
> View this message in context: 
http://r.789695.n4.nabble.com/Problem-with-
> segmented-function-tp4639227.html
> Sent from the R help mailing list archive at Nabble.com.
> 
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