Good! I think that there was a change in VGAM...
Kosuke
On Wed, 15 Nov 2006, B. Dan Wood wrote:
That fixes the problem. Didn't need this in
earlier versions?????
B. Dan Wood
Department of Political Science
Texas A&M University
4348 TAMUS
College Station, TX 77843-4348
Phone Numbers
Office: 979-845-1610
Home: 979-690-0390
Cell: 979-204-9147
FAX: 979-847-8924
Email: bdanwood(a)polisci.tamu.edu
Homepage:
http://www-polisci.tamu.edu/faculty/wood/
-----Original Message-----
From: Kosuke Imai [mailto:kimai@Princeton.Edu]
Sent: Wednesday, November 15, 2006 10:55 AM
To: B. Dan Wood
Cc: zelig(a)latte.harvard.edu
Subject: RE: [zelig] problem with Zelig
I think you need to do
as.factor(LETTERS)
for the dependent variable. Let me know if that doesn't solve the problem.
Kosuke
On Wed, 15 Nov 2006, B. Dan Wood wrote:
Reinstalled VGAM and did not attach the data.
Here is the output.
R version 2.4.0 (2006-10-03)
Copyright (C) 2006 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
R is free software and comes with ABSOLUTELY NO WARRANTY.
You are welcome to redistribute it under certain conditions.
Type 'license()' or 'licence()' for distribution details.
Natural language support but running in an English locale
R is a collaborative project with many contributors.
Type 'contributors()' for more information and
'citation()' on how to cite R or R packages in publications.
Type 'demo()' for some demos, 'help()' for on-line help, or
'help.start()' for an HTML browser interface to help.
Type 'q()' to quit R.
Spector <- read.table("c:/Documents and
Settings/B. Dan Wood/My
Documents/My Teaching/Maximum
Likelihood/Data/Letters.txt", header=TRUE)
summary(Spector)
OBS GPA TUCE PSI
Min. : 1.00 Min. :2.060 Min. :12.00 Min. :0.0000
1st Qu.: 8.75 1st Qu.:2.813 1st Qu.:19.75 1st Qu.:0.0000
Median :16.50 Median :3.065 Median :22.50 Median :0.0000
Mean :16.50 Mean :3.117 Mean :21.94 Mean :0.4375
3rd Qu.:24.25 3rd Qu.:3.515 3rd Qu.:25.00 3rd Qu.:1.0000
Max. :32.00 Max. :4.000 Max. :29.00 Max. :1.0000
GRADE LETTERS
Min. :0.0000 Min. :0.000
1st Qu.:0.0000 1st Qu.:1.000
Median :0.0000 Median :1.000
Mean :0.3438 Mean :1.344
3rd Qu.:1.0000 3rd Qu.:2.000
Max. :1.0000 Max. :2.000
library(Zelig)
Loading required package: MASS
Loading required package: boot
##
## Zelig (Version 2.7-4, built: 2006-11-10)
## Please refer to
http://gking.harvard.edu/zelig for full documentation
## or help.zelig() for help with commands and models supported by Zelig.
##
mlogit.out <- zelig(LETTERS ~ GPA + TUCE +
PSI, model = "mlogit", data =
Spector)
Loading required package: VGAM
Loading required package: splines
Loading required package: stats4
Attaching package: 'VGAM'
The following object(s) are masked from package:splines :
bs
The following object(s) are masked from package:splines :
ns
The following object(s) are masked from package:boot :
logit
The following object(s) are masked from package:boot :
simplex
The following object(s) are masked from package:stats :
glm
The following object(s) are masked from package:stats :
lm
The following object(s) are masked from package:stats :
poly
The following object(s) are masked from package:stats :
predict.glm
The following object(s) are masked from package:stats :
predict.lm
The following object(s) are masked from package:stats :
predict.mlm
The following object(s) are masked from package:base :
scale.default
Error in dimnames(xbig) <- list(vlabel(yn, rep(M, n), M), vlabel(xn,
ncolBlist, :
length of 'dimnames' [1] not equal to array extent
summary(mlogit.out)
Error: object
"mlogit.out" not found
Error in summary(mlogit.out) : error in evaluating the argument 'object'
in
selecting a method for function
'summary'
B. Dan Wood
Department of Political Science
Texas A&M University
4348 TAMUS
College Station, TX 77843-4348
Phone Numbers
Office: 979-845-1610
Home: 979-690-0390
Cell: 979-204-9147
FAX: 979-847-8924
Email: bdanwood(a)polisci.tamu.edu
Homepage:
http://www-polisci.tamu.edu/faculty/wood/
-----Original Message-----
From: Kosuke Imai [mailto:kimai@Princeton.Edu]
Sent: Wednesday, November 15, 2006 9:02 AM
To: B. Dan Wood
Cc: zelig(a)latte.harvard.edu
Subject: Re: [zelig] problem with Zelig
Hi Dan,
Can you try this without attaching the data? In general, it's a good idea
not to attach it since it may mask some of the important objects in your
workspace. Also, please make sure to update VGAM from CRAN.
Thanks!
Kosuke
-----------------------------------------------------
Kosuke Imai Office: Corwin Hall 041
Assistant Professor Phone: 609-258-6601
Department of Politics eFax: 973-556-1929
Princeton University Email: kimai(a)Princeton.Edu
Princeton, NJ 08544-1012
http://imai.princeton.edu
-----------------------------------------------------
On Tue, 14 Nov 2006, B. Dan Wood wrote:
> I have the latest version of R with the latest release of Zelig
installed.
I
> have no libraries installed at startup. These commands worked fine two
> releases ago. Running a multinomial logit, I get the following output.
>
>
>
> Help.
>
>
>
>
>
>> Spector <- read.table("c:/Documents and Settings/B. Dan Wood/My
> Documents/My Teaching/Maximum Likelihood/Data/Letters.txt", header=TRUE)
>
>> attach(Spector)
>
>
>
> The following object(s) are masked from package:base :
>
>
>
> LETTERS
>
>
>
>> summary(Spector)
>
> OBS GPA TUCE PSI
>
> Min. : 1.00 Min. :2.060 Min. :12.00 Min. :0.0000
>
> 1st Qu.: 8.75 1st Qu.:2.813 1st Qu.:19.75 1st Qu.:0.0000
>
> Median :16.50 Median :3.065 Median :22.50 Median :0.0000
>
> Mean :16.50 Mean :3.117 Mean :21.94 Mean :0.4375
>
> 3rd Qu.:24.25 3rd Qu.:3.515 3rd Qu.:25.00 3rd Qu.:1.0000
>
> Max. :32.00 Max. :4.000 Max. :29.00 Max. :1.0000
>
> GRADE LETTERS
>
> Min. :0.0000 Min. :0.000
>
> 1st Qu.:0.0000 1st Qu.:1.000
>
> Median :0.0000 Median :1.000
>
> Mean :0.3438 Mean :1.344
>
> 3rd Qu.:1.0000 3rd Qu.:2.000
>
> Max. :1.0000 Max. :2.000
>
>>
>
>> library(Zelig)
>
> Loading required package: MASS
>
> Loading required package: boot
>
> ##
>
> ## Zelig (Version 2.7-4, built: 2006-11-10)
>
> ## Please refer to
http://gking.harvard.edu/zelig for full documentation
>
> ## or help.zelig() for help with commands and models supported by Zelig.
>
> ##
>
>> mlogit.out <- zelig(LETTERS ~ GPA + TUCE + PSI, model = "mlogit",
data
=
Spector)
Loading required package: VGAM
Loading required package: splines
Loading required package: stats4
Attaching package: 'VGAM'
The following object(s) are masked from package:splines :
bs
The following object(s) are masked from package:splines :
ns
The following object(s) are masked from package:boot :
logit
The following object(s) are masked from package:boot :
simplex
The following object(s) are masked from package:stats :
glm
The following object(s) are masked from package:stats :
lm
The following object(s) are masked from package:stats :
poly
The following object(s) are masked from package:stats :
predict.glm
The following object(s) are masked from package:stats :
predict.lm
The following object(s) are masked from package:stats :
predict.mlm
The following object(s) are masked from package:base :
scale.default
Error in dimnames(xbig) <- list(vlabel(yn, rep(M, n), M), vlabel(xn,
ncolBlist, :
length of 'dimnames' [1] not equal to array extent
summary(mlogit.out)
Error: object "mlogit.out" not found
Error in summary(mlogit.out) : error in evaluating the argument 'object'
in
selecting a method for function
'summary'
B. Dan Wood
Department of Political Science
Texas A&M University
4348 TAMUS
College Station, TX 77843-4348
Phone Numbers
Office: 979-845-1610
Home: 979-690-0390
Cell: 979-204-9147
FAX: 979-847-8924
Email: bdanwood(a)polisci.tamu.edu
Homepage:
http://www-polisci.tamu.edu/faculty/wood/
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