Re: [amelia] Error in amelia(data = x) : argument "x" is missing, with no default" - Amelia

4 May 2009

Hi Tom,

I think the problem might be that you are missing the latest update of
Amelia (there was a slight change in the syntax from version 1.1-xx to
1.2-xx). In order to get the latest version, try running the following
line of code:

install.packages("Amelia")

This should get you the latest version of Amelia that will fix the
error that you get from Amelia at the command line.

In terms of Zelig, I think that your syntax is incorrect. You should
see that Zelig documentation to get a clear sense of how to implement
your model, but if you want to run a linear model (OLS) with the
specification you've indicated, you can run it like so:

z.out <- zelig(IOP~ICP+CVP+CONCORDANCE, model = "ls", data =
output$imputations)

You shouldn't pass an "lm" object to zelig. You simply specify the
formula and the stochastic model. You can find the documentation for
Zelig at http://gking.harvard.edu/zelig/

I hope that helps,
matt.

2009/5/3 Θωμας &lt;blitskasvonarta(a)gmail.com&gt;om>:
...
  Thank you Dr Blackwell,

 First thank you for your time and for letting me use Amelia.
 I still experience problems:
 Lets say the file I need to impute is called mis (attached) and is saved as
 a txt file on the desktop.
 From the R environment :
 misi<-read.table('C:\\Documents and
Settings\\thomas\\Desktop\\mis.txt',
 header=T)
output<-amelia(x=misi, empri=10,ords=c(3,4))  this gives me the error :
"Error in amelia(x = misi, empri = 10, ords =
 c(3,4)) :   unused argument(s) (x = list(Patient = c(1, 1, 1, 1, 1 etc...
 if I do
  output<-amelia(x, empri=10,ords=c(3,4)) then
it produces imputations  However next at zelig
  z.out <- zelig(lm(IOP~ICP+CVP+CONCORDANCE),
data = output$imputations)  .
 I am getting the error "Error in eval(expr, envir, enclos) : object "IOP"
 not found"  Following the instructions at AmeliaView() and z.out <-
 zelig(lm(IOP~ICP+CVP+CONCORDANCE), data = output$imputations) I am getting
 the error "Error in eval(expr, envir, enclos) : object "IOP" not
found"
 Attached is the example file I am using.
 Once again thank you for your kindness to let me use Amelia.
 Regards,
 Tom Spentzas, ΜD, MS
 Ass Prof. at UT
 On Sun, May 3, 2009 at 2:02 PM, Matt Blackwell &lt;mblackwell(a)gmail.com&gt; wrote:

 Hello,

 The syntax of Amelia has changed in recent versions. You can run your
 code like so:

 output<-amelia(x=x, empri=10,ords=c(3,4))
 z.out <- zelig(***, data = output$imputations)

 where you would replace *** with your model and settings.

 If you call AmeliaView() from an R session, you can use the output
 option "Hold in R memory". Afterward, you can click on "File" then
 "Exit Amelia." Once you are back at the R prompt, you should be able
 to find your Amelia output. By default it is named "outdata." In order
 to use Zelig:

 z.out <- zelig(***, data = outdata$imputations)

 I hope this helps. Let us know if you have any more problems.

 Thanks for using Amelia!
 matt.

 On Sun, May 3, 2009 at 11:23 AM, Hylar &lt;blitskasvonarta(a)gmail.com&gt; wrote:
 > I am trying to understand how zelig can peak up the imputation files
 > generated by amelia . There isn't any example on the ppt course.
 > I used output<-amelia(data=x, empri=10,ords=c(3,4)) and I received an
 > error
 > message "Error in amelia(data = x) : argument "x" is missing, with
no
 > default"
 > Then I used the AmeliaView () I saved the 5 files on the desktop but I
 > do
 > not know how to pick them up with the zelig.
 > I will appreciate a simple example - first with "output<-amelia(data=x,
 > empri=10,ords=c(3,4))" and second with "AmeliaView()"
 > Thank you again,
 >
 >> Tom Spentzas, MD MD
 >> Ass Professor Univ of Tennessee.
 >
 > 

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