[R-sig-Geo] Spatstat: (coef(summary()) inquiry/problem.

[Rolf Turner]

On 21/05/14 03:28, Silvia Cordero-Sancho wrote:
> Hello,
>
> I am running a hybrid model (following Baddeleyet al 2013). I am using the
> ppm function, the tendency is being represented by a set of environmental
> variables  ("im"- format) and the incidence is being represented by a
> hybrid model (StraussHard and AreaInter). It seems that everything is
> working properly, I have been able to use the following tools with the
> model (simulate(), diagnose.ppm()) but I have not been successful to use
> the tool  (coef(summary()).
>
> The problem is that it runs for hours,  which made me concern that there is
> something abnormal, (so I killed the process after a couple of hours). With
>   previous models (no hybrid ones) I was able to use this tool and display
> the coefficients without problem. I will like to know if this is "normal"
> or it is a sign that it is something abnormal with my model.
>
> I will appreciate any advise.

Follow up to my previous message --- I was too impatient with my toy 
example.  The summary() function *did* return a result, after a matter 
of minutes (rather than hours).

So it would seem that although it might be a bit slow, there is no 
fundamental problem with summary.ppm().  The problem would appear to be, 
to some extent, peculiar to your data set.

How many points are there in the pattern?  How messy is the observation 
window?

If you could make your data available we might be able to experiment and 
see if anything can be done to speed things up.

cheers,

Rolf Turner