I am using the effects package to construct some probability graphs showing
the predicted probabilities from a logistic regression model.
However, I get an odd error message and don't know what the issue is.
When I attempt to generate the plots, I get the following error:
dat$won_ping = as.factor(dat$won_ping)
mod2 = glm(won_ping ~ our_bid +
age_of_oldest_driver2 +
credit_type2 +
coverage_type2 +
home_owner2 +
vehicle_driver_score +
currently_insured2 +
zipcode2,
data=dat, family=binomial(link="logit"))
> plot(effect("our_bid*home_owner2", mod2), rescale.axis=FALSE,
> multiline=TRUE)Warning message:In analyze.model(term, mod, xlevels,
> default.levels) :
our_bid:home_owner2 does not appear in the modelError in
plot(effect("our_bid*home_owner2", mod2), rescale.axis = FALSE, :
error in evaluating the argument 'x' in selecting a method for
function 'plot': Error in apply(mod.matrix[, components], 1, prod) :
subscript out of bounds
Here's info on my data and my glm commands:
> str(dat)'data.frame': 85240 obs. of 71 variables:
$ our_bid : num 155 123 183 98 108 159 98 123 98 200 ...
$ won_ping : Factor w/ 2 levels "0","1": 1 1 2 1 1
1 1 1 1 1 ...
$ zipcode2 : Factor w/ 4 levels
"1:6999","10000:14849",..: 4 3 2 1 3 2 3 1 2 2 ...
$ age_of_oldest_driver2 : Factor w/ 4 levels "18 to 21","22 to
25",..: NA 3 NA NA NA NA 3 NA 3 NA ...
$ currently_insured2 : Factor w/ 2 levels "0","1": 2 1 2 2 1
1 2 2 1 1 ...
$ credit_type2 : Ord.factor w/ 4 levels
"POOR"<"FAIR"<..: 2 3 2 3 2 2 1 3 3 2 ...
$ coverage_type2 : Factor w/ 4 levels
"BASIC","MINIMUM",..: 4 3 3 3 3 3 3 3 4 3 ...
$ home_owner2 : Factor w/ 2 levels "0","1": 1 2 2 2 2
2 2 2 2 2 ...
$ vehicle_driver_score : Factor w/ 2 levels "0","1": 1 1 1 1 1
1 1 1 1 1 ...
dat$won_ping = as.factor(dat$won_ping)
mod2 = glm(won_ping ~ our_bid +
age_of_oldest_driver2 +
credit_type2 +
coverage_type2 +
home_owner2 +
vehicle_driver_score +
currently_insured2 +
zipcode2,
data=dat, family=binomial(link="logit"))
summary(mod2)
And finally, here might be some useful info:
> sessionInfo()R version 2.14.0 (2011-10-31)
Platform: x86_64-pc-mingw32/x64 (64-bit)
locale:
[1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United
States.1252 LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C LC_TIME=English_United
States.1252
attached base packages:
[1] grid stats graphics grDevices utils datasets
methods base
other attached packages:
[1] effects_2.2-1 colorspace_1.1-1 nnet_7.3-1 MASS_7.3-16
lattice_0.20-0 foreign_0.8-46
loaded via a namespace (and not attached):
[1] tools_2.14.0
Thanks,
Abraham
> sessionInfo()R version 2.14.0 (2011-10-31)
Platform: x86_64-pc-mingw32/x64 (64-bit)
locale:
[1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United
States.1252 LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C LC_TIME=English_United
States.1252
attached base packages:
[1] grid stats graphics grDevices utils datasets
methods base
other attached packages:
[1] effects_2.2-1 colorspace_1.1-1 nnet_7.3-1 MASS_7.3-16
lattice_0.20-0 foreign_0.8-46
loaded via a namespace (and not attached):
[1] tools_2.14.0
--
*Abraham Mathew
Statistical Analyst
www.amathew.com
720-648-0108
@abmathewks*
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