Dear Prof. Fox,
I just picked up R not long ago, and apologize that I am not that
familiar with some basics. I am trying to replicate what I can do with
Stata in R. Thanks for all your help!
On Thu, Oct 20, 2011 at 2:47 PM, John Fox wrote:
> Dear Xu Jun,
>
> On Thu, 20 Oct 2011 14:41:30 -0400
>
Dear Xu Jun,
On Thu, 20 Oct 2011 14:41:30 -0400
Xu Jun wrote:
> Dear Professor Fox,
>
> Now I got it. It all comes from my unfamiliarity with the effect
> function. I forgot the c part in the given.values option, plus it
> looks like plot(effect()) does not like factor(warm) in the polr
> funct
Dear Professor Fox,
Now I got it. It all comes from my unfamiliarity with the effect
function. I forgot the c part in the given.values option, plus it
looks like plot(effect()) does not like factor(warm) in the polr
function. So here are the two working lines:
ordwarm2$warm2 <- as.factor(ordwarm2
Dear Xu Jun,
It's really not possible for me to know the source of the error without a
complete, reproducible example, but if I had to guess, I'd guess that there's a
scoping problem of some sort, with the value of yr89 coming from somewhere that
you don't expect. How about fitting the original
Dear Professor Fox,
I didn't include codes in between these two commands (polr and
plot(effect()). I am still trying to work it out. Maybe it's related
to how I coded some of the factor variables as I got some successful
runs after I changed the coding for some factor variables. I will keep
workin
Dear Professor Fox,
Thanks a lot! That is an embarrassing error. After I cleaned up and
simplified my codes, and ran the following two lines:
myologit <- polr(factor(warm) ~ yr89 + male + white + age + ed + prst,
+ data=ordwarm2, method=c("logistic"))
plot(effect("age", myologit, x
Dear Xu Jun,
I'm not sure whether this is the source of the error, but it may help to spell
the xlevels argument correctly (it is not "xlevles").
I hope this helps,
John
John Fox
Sen. William McMaster Prof. of Social Statistics
Department of Soc
Dear r-help listers,
I am using effects to produce an effect plot after the proportional
odds logistic regression model. There is no problem for me to estimate
the model, but when it comes to the graphing, I was stuck. see the
codes below:
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