Amelia May 2009

amelia@lists.gking.harvard.edu

5 participants
6 discussions

could we use multiply imputed dataset for a descriptive purpose?

by Frank Liu

Dear MI experts, I am new to the field of MI and just learned Amelia II. I like to know if the imputed data sets, say 10, generated with Amelia II can be used to study the distribution of variables that were included in the MI process. Specifically, I like to impute party identification, which has about 30% missing, and explore (and hopefully restore) the proportion of partisan voters. Is it proper (or it is too naive) to could use imputed data sets in this descriptive and predictive way? If multiply imputed data sets can be used this way, what could be the best strategy to use these ten sets of proportions? (e.g., averaging them? plotting them?) Thank you very much. Best, Frank -- Frank C.S. Liu Assistant Professor, Institute of Political Science E-mail: frankcsliu(a)gmail.com National Sun Yat-sen University (NYSYU) Office:+886.7.525.2000 #5555 Kaohsiung, Taiwan 804, R.O.C. FAX:+886.7.525.5540 - Amelia mailing list served by Harvard-MIT Data Center [Un]Subscribe/View Archive: http://lists.gking.harvard.edu/?info=amelia More info about Amelia: http://gking.harvard.edu/amelia

14 years, 11 months

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

by Matt Blackwell

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$imputations) You shouldn't pass an "lm" object to zelig. You simply specify the formula and the stochastic model. You can find the documentation for Zelig at http://gking.harvard.edu/zelig/ I hope that helps, matt. 2009/5/3 Θωμας <blitskasvonarta(a)gmail.com>: > Thank you Dr Blackwell, > > First thank you for your time and for letting me use Amelia. > I still experience problems: > Lets say the file I need to impute is called mis (attached) and is saved as > a txt file on the desktop. > From the R environment : >>misi<-read.table('C:\\Documents and Settings\\thomas\\Desktop\\mis.txt', >> header=T) >>output<-amelia(x=misi, empri=10,ords=c(3,4)) > this gives me the error : "Error in amelia(x = misi, empri = 10, ords = > c(3,4)) : unused argument(s) (x = list(Patient = c(1, 1, 1, 1, 1 etc... > if I do >> output<-amelia(x, empri=10,ords=c(3,4)) then it produces imputations > However next at zelig >> z.out <- zelig(lm(IOP~ICP+CVP+CONCORDANCE), data = output$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$imputations) I am getting > the error "Error in eval(expr, envir, enclos) : object "IOP" not found" > Attached is the example file I am using. > Once again thank you for your kindness to let me use Amelia. > Regards, > Tom Spentzas, ΜD, MS > Ass Prof. at UT > On Sun, May 3, 2009 at 2:02 PM, Matt Blackwell <mblackwell(a)gmail.com> wrote: >> >> Hello, >> >> The syntax of Amelia has changed in recent versions. You can run your >> code like so: >> >> output<-amelia(x=x, empri=10,ords=c(3,4)) >> z.out <- zelig(***, data = output$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 <blitskasvonarta(a)gmail.com> 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. >> > >> > > > > - Amelia mailing list served by Harvard-MIT Data Center [Un]Subscribe/View Archive: http://lists.gking.harvard.edu/?info=amelia More info about Amelia: http://gking.harvard.edu/amelia

14 years, 11 months

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

by ��

---------- Forwarded message ---------- From: Θωμας <blitskasvonarta(a)gmail.com> Date: 2009/5/3 Subject: Re: [amelia] Error in amelia(data = x) : argument "x" is missing, with no default" To: Matt Blackwell <mblackwell(a)gmail.com> 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 <mblackwell(a)gmail.com> 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 <blitskasvonarta(a)gmail.com> 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. > > > > >

14 years, 11 months

Error in amelia(data = x) : argument "x" is missing, with no default"

by ��

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.

14 years, 11 months

AmeliaView

by Myers, Nicholas

Hello. I am having trouble downloading AmeliaView and I am hoping that someone can advise. 1. I have R 2.9.0 on my computer in Program Files (x86). 2. Vista is my operating system. 3. I downloaded Amelia-setup and ran the file. 4. When I go to AmeliaView folder within C:\Program Files (x86) I do not have amelia.bat. I only have uninstall.exe and installinfo file. Any advice? Thank you. nick myers ----------------------------------------------------------------------- Nicholas D. Myers, Ph.D. University of Miami School of Education Department of Educational and Psychological Studies Research, Measurement and Evaluation program Merrick Building 311E P.O. Box 248065 Coral Gables, FL 33124-2040 Tel: 305.284.9803 Fax: 305.284.3003 E-mail: nmyers(a)miami.edu http://www.education.miami.edu/facultyStaff/Faculty_Bio.asp?ID=143 ----------------------------------------------------------------------- - Amelia mailing list served by Harvard-MIT Data Center [Un]Subscribe/View Archive: http://lists.gking.harvard.edu/?info=amelia More info about Amelia: http://gking.harvard.edu/amelia

14 years, 11 months

Error in amelia(data = x) : argument "x" is missing, with no default

by ��

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.

14 years, 11 months

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Amelia May 2009