[R-sig-Geo] sarprobit question
Good day everyone.
I have been trying to conduct a Spatial Autoregressive probit model in R.
To do so, I added the shapefile (points) that contains all my information
into R, and from it I constructed the spatial weighted matrix by specifying
k=3 nearest neighbors.
tbe <- readShapePoints('tech_full.shp',
proj4string=CRS("+init=epsg:32719"))
coortbe <- coordinates(tbe)
col.knn1 <- knearneigh(coortbe, k=3)
plot(knn2nb(col.knn1), coortbe, add=TRUE)
neig <- knn2nb(col.knn1,row.names=tbe$Number)
listw <- nb2listw(neig, style = "W")
W <- as(as_dgRMatrix_listw(listw), "CsparseMatrix")
Until this point, R does not give me any warnings or error messages.
Immediately, I execute the following code to fit the spatial AR probit
model (package: 'spatialprobit')
sarprobit.fit1 <- sarprobit(NV25 ~ SD46 + SD45 + PC18 + PC22 + SS13t +
Age + Gender + sra + sla + saa + uwue, data = tbe, W)
the following error appears:
>Error: Matrices must have same dimensions in .Arith.Csparse(e1, e2,
.Generic, class. = "dgCMatrix")*
Looking into W I found: i=306, p=103. Moreover, tbe has 102 observations.
I first thought that this p=103 was the error, however I did the following:
wnew <-W[-1,]
sarprobit.fit1 <- sarprobit(NV25 ~ SD46 + SD45 + PC18 + PC22 + SS13t +
Age + Gender + sra + sla + saa + uwue, data = tbe, wnew)
Now, the following error appears:
>Error in sar_probit_mcmc(y, X, W, ...) :
sarprobit: spatial weights matrix W must be a sparse matrix with zeros in
the main diagonal
I tried other software, such as GeoDa. However, since my dependent variable
is binary, I did not found on it a proper model for my data.
My question is, did someone deal with this error? and if so, how did you
manage to solve it? I looked in google for this error but did not have any
luck.
Best,
Jorge
*Ing. Jorge Alfredo Cárcamo, M. Sc., Ph. D. (c)*
[[alternative HTML version deleted]]
___
R-sig-Geo mailing list
R-sig-Geo@r-project.org
https://stat.ethz.ch/mailman/listinfo/r-sig-geo
Re: [R-sig-Geo] sarprobit question
Hi, > I first thought that this p=103 was the error, however I did the following: > >wnew <-W[-1,] You need to remove one row AND one column to have a 102x102 matrix. In the code above you are just removing one row. I believe that the error is there. But you should check why you W is 103x103 if you only have 102 data points… Best, Virgilio ___ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo
Re: [R-sig-Geo] sarprobit question
Dear Virgilio, Thank you very much for your answer. Effectively, your observation is correct, after I drop a column the command works. I will take a look at the commands to understand why is creating this W=103x103 matrix. Do you have some suggestions? Once again, thank you very much for your quick reply. Best, Jorge *Ing. Jorge Alfredo Cárcamo, M. Sc., Ph. D. (c)* On Thu, Apr 21, 2016 at 4:58 PM, VIRGILIO GOMEZ RUBIO < virgilio.go...@uclm.es> wrote: > Hi, > > > I first thought that this p=103 was the error, however I did the > following: > > > >wnew <-W[-1,] > > You need to remove one row AND one column to have a 102x102 matrix. In the > code above you are just removing one row. I believe that the error is > there. But you should check why you W is 103x103 if you only have 102 data > points… > > Best, > > Virgilio > > [[alternative HTML version deleted]] ___ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo
Re: [R-sig-Geo] sarprobit question
Hi, > Thank you very much for your answer. Effectively, your observation is > correct, after I drop a column the command works. > Please, note that dropping the column will give you a 102x102 but, as Obi-Wan Kenobi would say, "this is not the matrix you are looking for”. :) What I mean is that you probably will get a wrong adjacency matrix. :) > I will take a look at the commands to understand why is creating this > W=103x103 matrix. Do you have some suggestions? If you provide a reproducible example (i.e., code plus data) I could look into it. Feel free to contact me off list. Best, Virgilio ___ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo
Re: [R-sig-Geo] sarprobit question
Dear Jorge, > > I will take a look at the commands to understand why is creating this > W=103x103 matrix. Do you have some suggestions? > You probably have 103 points instead of 102 for some reason… That is what I would check first. Best, Virgilio ___ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo
Re: [R-sig-Geo] sarprobit question
Dear Virigilio, Many thanks for your suggestion. I also think that my problem is within my data and not with my commands. I used the same commands with the columbus dataset and it run smoothly. The only difference is that columbus dataset are polygons and I am working with point dataset. The funny thing is that a friend of mine give me another point dataset, when I tried to run the commands it gives me the same error message, even if I drop one column and one row. I will prepare a subset of this dataset and the script to reproduce the commands. However, I am hoping to do that this week, since I have to prepare and give a presentation tomorrow. Once again, many thanks for your kind help and attention. Jorge *Ing. Jorge Alfredo Cárcamo, M. Sc., Ph. D. (c)* On Tue, Apr 26, 2016 at 12:03 PM, VIRGILIO GOMEZ RUBIO < virgilio.go...@uclm.es> wrote: > Dear Jorge, > > > > > I will take a look at the commands to understand why is creating this > W=103x103 matrix. Do you have some suggestions? > > > > You probably have 103 points instead of 102 for some reason… That is what > I would check first. > > Best, > > Virgilio > > [[alternative HTML version deleted]] ___ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo
