Achim - Everyone
Yes, I did exactly as you've suggested. I did the analysis over on both my
windows XP machine and on my Linux machine.
It worked correctly. I don't recall which other packages I installed the
first time, but there was a conflict.
Thanks you for the attention and the great replies.
Steve
Steve Friedman Ph. D.
Spatial Statistical Analyst
Everglades and Dry Tortugas National Park
950 N Krome Ave (3rd Floor)
Homestead, Florida 33034
steve_fried...@nps.gov
Office (305) 224 - 4282
Fax (305) 224 - 4147
Achim Zeileis
<achim.zeil...@ui
bk.ac.at> To
steve_fried...@nps.gov
02/24/2010 04:20 cc
PM r-help@r-project.org
Subject
Re: [R] mlogit is not an S4 object
error
On Wed, 24 Feb 2010, steve_fried...@nps.gov wrote:
>
> Hello,
>
> I've been getting the following error when using the mlogit function
from
> the mlogit package
>
> This is one of the examples provided in the Package "mlogit" January 27,
> 2010 description
>
> data("Fishing", package="mlogit")
> Fish <- mlogit.data(Fishing, varying = c(4:11), shape="wide",
> choice="mode")
> summary(mlogit(mode ~ pr + ca - 1, data = Fish))
>
>
> Call:
> Error in deparse(obj...@call) :
> trying to get slot "call" from an object (class "mlogit") that is not an
> S4 object
>
> I'm running on Windows XP R 2.10.1
>
> Does anyone have any ideas why this is failing ?
I cannot replicate this problem. I get the desired result (see below).
This is also unlikely to be a problem in the package itself because the
examples are checked daily on CRAN, see
http://CRAN.R-project.org/web/checks/check_results_mlogit.html
My guess is that you have loaded some other package (other than "mlogit")
that defines an S4 generic for summary() that somehow messes up the
dispatch for mlogit. Please try to reinstall the package and run the
package in a fresh R session to check whether the problem persists.
Best,
Z
R> library("mlogit")
Loading required package: Formula
Loading required package: statmod
R> data("Fishing", package="mlogit")
R> Fish <- mlogit.data(Fishing, varying = c(4:11), shape="wide",
+ choice="mode")
R> summary(mlogit(mode ~ pr + ca - 1, data = Fish))
Call:
mlogit(formula = mode ~ pr + ca - 1, data = Fish, method = "nr",
print.level = 0)
Frequencies of alternatives:
beach boat charter pier
0.11337 0.35364 0.38240 0.15059
nr method
6 iterations, 0h:0m:0s
g'(-H)^-1g = 7.22E-11
optimum reached
Coefficients :
Estimate Std. Error t-value Pr(>|t|)
pr -0.0204765 0.0012231 -16.742 < 2.2e-16 ***
ca 0.9530985 0.0894134 10.659 < 2.2e-16 ***
---
Signif. codes: 0 '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1
Log-Likelihood: -1312
> Thanks
> Steve
>
> Steve Friedman Ph. D.
> Spatial Statistical Analyst
> Everglades and Dry Tortugas National Park
> 950 N Krome Ave (3rd Floor)
> Homestead, Florida 33034
>
> steve_fried...@nps.gov
> Office (305) 224 - 4282
> Fax (305) 224 - 4147
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
