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
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and provide commented, minimal, self-contained, reproducible code.
