Hello,
I am trying to run an ordinal logistic regression (polr) using the package
'MASS'.
I have successfully run other regression classes (glm, multinom) without
much problem, but with the 'polr' class I get the following error:
" Error in svd(X) : infinite or missing values in 'x' "
which appears when I run the "summary" command.
The data file is large (585000 rows) and has no NA, -9999 or blank values.
My script (in brief) is as follows, with results:
############
> library(MASS)
>
> ## ADD DATA
> Jdata<- read.delim("/Analysis/20120709 JLittle data file.txt", header=T)
>
> attach(Jdata)
> names(Jdata)
[1] "POINTID" "Lat_Y_pos" "JVeg5" "Subregion" "Rock_U_Nam"
"Rock_Name" "Elevation" "Slope" "Aspect" "Hillshade"
"Stream_dist" "Coast_dist" "Coast_SE"
[14] "Coast_E" "Wind_310" "TPI" "Landform"
>
> Global <- polr(JVeg5 ~ Elevation + Lat_Y_pos + Coast_dist + Stream_dist,
> data=Jdata)
>
> summary(Global)
Error in svd(X) : infinite or missing values in 'x'
>
##Try with omit NA command
> Global <- polr(JVeg5 ~ Elevation + Lat_Y_pos + Coast_dist + Stream_dist,
> data=Jdata, na.action = na.omit, Hess = TRUE)
>
> summary(Global)
Error in svd(X) : infinite or missing values in 'x'
############
Does this imply an 'infinite value' and what would this mean?
If anyone has any idea how to address this error, I would very much
appreciate your response.
Thank you in advance.
Jeremy
Date File Attachment (200 rows):
http://r.789695.n4.nabble.com/file/n4635829/20120709_JLittle_data_file.txt
20120709_JLittle_data_file.txt
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