mi(): Error in attach(data) : all elements of a list must be named (fwd) - Zelig

21 Aug 2011

Hi,

After updating to R 2.13.1 and updating Zelig to 3.5-1, the following error 
appears when I try to use the mi() command in Zelig.  I ran the exact same code 
in R 2.8 and it worked fine.

Error in attach(data) : all elements of a list must be named

Any ideas?  Complete code and SessionInfo is below:

Thank you,
Audrey

library(Zelig)

Loading required package: MASS
Loading required package: boot
Loading required package: MNP
MNP: R Package for Fitting the Multinomial Probit Model
Version: 2.6-2
##
##  Zelig (Version 3.5-1, built: 2011-03-25)
##  Please refer to http://gking.harvard.edu/zelig for full
##  documentation or help.zelig() for help with commands and
##  models supported by Zelig.
##

##  Zelig project citations:
##    Kosuke Imai, Gary King, and Olivia Lau. (2009).
##    ``Zelig: Everyone's Statistical Software,''
##    http://gking.harvard.edu/zelig.
##  and
##    Kosuke Imai, Gary King, and Olivia Lau. (2008).
##    ``Toward A Common Framework for Statistical Analysis
##    and Development,'' Journal of Computational and
##    Graphical Statistics, Vol. 17, No. 4 (December)
##    pp. 892-913.

##  To cite individual Zelig models, please use the citation format printed 
with
##  each model run and in the documentation.
##
Warning message:
'.readRDS' is deprecated.
Use 'readRDS' instead.
See help("Deprecated")
...
  library(Amelia) Loading required package:
foreign
##
## Amelia II: Multiple Imputation
## (Version 1.2-18, built: 2010-11-04)
## Copyright (C) 2005-2011 James Honaker, Gary King and Matthew Blackwell
## Refer to http://gking.harvard.edu/amelia/ for more information
##
...
  sessionInfo() R version 2.13.1 (2011-07-08)
Platform: i386-pc-mingw32/i386 (32-bit)

locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] Amelia_1.2-18  foreign_0.8-45 Zelig_3.5-1    MNP_2.6-2      boot_1.3-2
[6] MASS_7.3-14

...
  data(turnout)
 data(immi1, immi2, immi3, immi4, immi5)
 z.out <- zelig(as.factor(ipip) ~ wage1992 + prtyid + ideol, + model =
"ologit",
+ data = mi(immi1, immi2, immi3, immi4, immi5))
Error in attach(data) : all elements of a list must be named

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