[R] Problem with breakpoints (strucchange)

Achim Zeileis Achim.Zeileis at wu-wien.ac.at
Fri Apr 16 19:15:53 CEST 2004

On Fri, 16 Apr 2004 13:21:13 -0400 kjetil at entelnet.bo wrote:

> Hola!
> I am using package strucchange, and encounters the following:
> >  bp <- breakpoints(diesel90  ~ regress -1, h=NULL)
> Error in La.chol2inv(x, size) : element (14, 14) is zero, so the 
> inverse cannot be computed
> The obvious problems have been checked, that is, the model matrix is 
> of full rank. What can be causing this?

For segmenting the model each sub-model you are fitting has to have a
regressor matrix of full rank. Is `regress' a factor? If so, the minimal
segment size h has to be large enough that the corresponding
coefficients can be estimated in each (potential) segment.

> I can send some data if that can be of help.

If you cannot solve the problem, you can also contact me off-list.


> Kjetil Halvorsen
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