Amelia April 2005

amelia@lists.gking.harvard.edu

3 participants
4 discussions

by Gary King

On Thu, 28 Apr 2005, Speybroeck, Niko wrote: > Dear Professor King, > > My name is Niko Speybroeck and I started working for WHO a few months > ago. One of the persons I work with is David Evans. > I am trying out Amelia and compare it with some other software for > imputing data. > > I have some questions (the first related to Amelia)? > > -- Is the main difference between Amelia and NORM, that NORM uses data > augmentation and Amelia EM Importance Sampling as a method? Is the IP > method in your paper with Honaker et al. equivalent to NORM? I got some > problems when using the IP option in Amelia (the Windows version, I do > not have Gauss). Do you have any advice? Do you know about a paper > comparing these two? Furthermore do you know about the mice software of > van Buuren? How does it compare to Amelia? Can you use the same > variables to impute as the ones you use in the analysis? NORM and Amelia's EMis will give almost identical answers, but Amelia is much faster. it also requires less expertise to use well since NORM requires that you understand MCMC diagnostics. I don't know the details of MICE. the paper we wrote explains these things. see http://gking.harvard.edu/files/abs/evil-abs.shtml > > -- Do you agree with the following statement (based on Schafer (2003) > Statistica Neerlandica 57, 19-35): "In the early years, many thought > that imputing data under one model and analysing the imputed datasets > under another model was ludicrous and potentially harmful but in some > settings, there might be advantages when imputation and analysis models > differ."? > Do you also feel that the imputation model should at least contain all > the variables in the model used to analyse the imputed data? its ok for the two models to differ, but the imputation model should include all the variables (and squares and such) from the analysis model. our paper talks a lot more about this; I suggest you have a look. > > Thanks a lot in advance for your answers and advice. If you have any > references related to these questions, do not hesitate to let me know. best of luck with your research. Gary King --- Gary King Institute for Quantitative Social Science Harvard University, 34 Kirkland St, Cambridge, MA 02138 http://GKing.Harvard.Edu, email: King(a)Harvard.Edu Direct 617-495-2027, Assistant 495-9271, eFax 812-8581 > > Kin > > > - Amelia mailing list served by Harvard-MIT Data Center [Un]Subscribe/View Archive: http://lists.hmdc.harvard.edu/?info=amelia

18 years, 11 months

Urgent:Seeking help - error G0104

by gliu1＠nd.edu

Hi all, I'm a Ph.D. student in Sociology at the University of Notre Dame. I am writing to seek help with a problem that I ran into while doing multiple imputation with Amelia. It was Stage 4 of the imputation process, when all of a sudden the windows disappeared. I checked the resulting file, and it says "C:\GAUSS\SRC\AMUTIL.SRC(391) : error G0104 : Argument must be positive Currently active call: RNDB [391]". Anyone knows what the cause is for this error and how to solve the problem? Thank you very much!!! GE LIU - Amelia mailing list served by Harvard-MIT Data Center [Un]Subscribe/View Archive: http://lists.hmdc.harvard.edu/?info=amelia

18 years, 11 months

Re: Question on error message: error G0056 : Too many active locals

by Gary King

its not a message I've seen before. one issue is how many variables you have. if you have more than 40 or so, you may be running into memory problems conceivably. one way to do this inadvertently is to specify the id variable as a nominal variable, in which case amelia will make 8165 variables out of it, so you migh check that you didn't do that. you might also check that you've read the data in the way you think its been read in by looking at the descriptive statistics. best of luck with your research, Gary : Gary King, King(a)Harvard.Edu http://GKing.Harvard.Edu : : Institute for Quantitative Social Science Direct (617) 495-2027 : : 34 Kirkland Street, Rm. 2 Assistant (617) 495-9271 : : Harvard University, Cambridge, MA 02138 eFax (617) 812-8581 : On Tue, 5 Apr 2005, Wells, Jason M (UMC-Student) wrote: > Dear Professor King, > > I am trying use Amelia to impute Afrobarometer data for my dissertation > project and, obviously, am not having much luck. The data reads in > fine, and I am perfectly able to tell the program that one variable is > completely full and another is an id variable, but when I run the > program it blows up and this is all the output I get: > > C:\GAUSS\SRC\SORTMC.SRC(89) : error G0056 : Too many active locals > Currently active call: SORTMC [89]. > > The only changes I have made to the defaults are those listed above > (telling it that one variable is full and another is an id). The > dataset is fairly large, 8166 observations and lots of variables, but > since the data has come in fine that doesn't seem to be the problem (at > least not yet). I've used Amelia before, though I must confess that I > wouldn't consider myself anything more than a novice user, but have > never encountered this error. I have also looked through the > documentation and listserv archive, but haven't seen any references to > this message. Any ideas on what's going wrong? > > By the way, I also posted this to the Amelia listserv, but wasn't sure > if I should send it to you as well and figured I was safest doing both. > > Thanks a bunch for your time and any help you can offer. Jason > > Jason M. Wells > Department of Political Science > University of Missouri-Columbia > 113 Professional Building > Columbia, MO 65211 > jmw9a7(a)mizzou.edu > > > - Amelia mailing list served by Harvard-MIT Data Center [Un]Subscribe/View Archive: http://lists.hmdc.harvard.edu/?info=amelia

19 years

Question on error message: error G0056 : Too many active locals

by Wells, Jason M (UMC-Student)

Hello all, I am trying use Amelia to impute and, obviously, am not having much luck. The data reads in fine, and I am perfectly able to tell the program that one variable is completely full and another is an id variable, but when I run the program it blows up and this is all the output I get: C:\GAUSS\SRC\SORTMC.SRC(89) : error G0056 : Too many active locals Currently active call: SORTMC [89]. The only changes I have made to the defaults are those listed above. The dataset is fairly large, 8166 observations and lots of variables, but since the data has come in fine that doesn't seem to be the problem (at least not yet). I've used Amelia before, though I must confess that I wouldn't consider myself anything more than a novice user, but have never encountered this error. I have also looked through the documentation and listserv archive, but haven't seen any references to this message. Anybody have any ideas on what's going wrong? Thanks a bunch, Jason Jason M. Wells Department of Political Science University of Missouri-Columbia 113 Professional Building Columbia, MO 65211 jmw9a7(a)mizzou.edu - Amelia mailing list served by Harvard-MIT Data Center [Un]Subscribe/View Archive: http://lists.hmdc.harvard.edu/?info=amelia

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Amelia April 2005