Amelia November 2002

amelia@lists.gking.harvard.edu

7 participants
7 discussions

by Gary King

if you have missing values on some but not all of the items in the scale, then impute first and sum at the end of the process of imputation. Gary King : Gary King, King(a)Harvard.Edu http://GKing.Harvard.Edu : : Center for Basic Research Direct (617) 495-2027 : : in the Social Sciences Assistant (617) 495-9271 : : 34 Kirkland Street, Rm. 2 HU-MIT DC (617) 495-4734 : : Harvard U, Cambridge, MA 02138 eFax (928) 832-7022 : On Fri, 22 Nov 2002, Michael Sauer wrote: > I have downloaded both Amelia for Windows and Clarify for Stata and I > have a questions about something I am not clear about. > > I have survey data that I had intended to create summated scales on > based on scales that had been defined by the survey author. Before I > can create these scales, it seems to me that I need to impute the > missing values for the individual survey items and run my ordered > probit using the scale calculated above as the dependent variable. > > At what point in the Amelia (imputing the missing observations) to > Clarify process would I create my summated scales? > > I would really appreciate any help you can provide. > > Michael L. Sauer > Associate Vice President for Administration > University of Nevada Las Vegas > 4505 Maryland Parkway > Las Vegas, NV 89154 > Phone: (702) 895-1073 > Fax: (702) 895-4929 > email: msauer(a)unlv.edu >

21 years, 4 months

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21 years, 5 months

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21 years, 5 months

Amelia questions

by EHudes＠psg.ucsf.edu

Hi Gary-- I recently started using Amelia (Windows version) to generate multiply-imputed datasets and Clarify package / -miest- to run statistical models and pull the parameter estimates together. I am still learning how to use it. I have a couple of question: 1) Is it possible to set a seed number, both in Amelia and in Clarify, so results can be exactly reproduced? 2) Is it possible to have Amelia save the settings of any run in a file, to document these settings? 3) (Just a wish list item. I don't think this is possible). Is it possible to run Amelia from a batch file, something similar to Stata's -do- files? It would save so much typing... 4) (Another item to add to the wish list). Do you have any plans to have an Amelia version for Stata? Or is it just unpractical? (I would then have access to all the parts of Amelia which currently only work with the Gauss version, such as the use of other MI algorithms, and the use of graphs.) Thank you for your help, --Estie Hudes. Estie Sid Hudes, PhD MPH University of California Prevention Sciences Group & Center for AIDS Prevention Studies 74 New Montgomery St., Suite 600, Box 0886 S.F. CA 94105 phone: 415.597.9126 fax: 415.597.9194 email: ehudes(a)psg.ucsf.edu Web: http://www.epibiostat.ucsf.edu/capsweb/people/hudesbio.html

21 years, 5 months

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21 years, 5 months

Re: Guass 5.0 Amelia error (fwd)

by Gary King

If anyone is using the first version of Gauss 5.0, they will find that Amelia-for-Gauss will not run because of a new reserved word, loada. Since loada is also a proc in Amelia, it generates a conflict. I've talked to Aptech about this and they have agreed to rename their reserved word (from loada to loadarray). They hadn't documented loada in their first release and so this shouldn't cause their other users any problems. The new version of Gauss 5 is numbered 5.0.15 and it will be available on Monday or Tuesday for download. Ameilia-for-Gauss should run fine then. Thanks to Thomas Flottemesch for finding the problem. Gary : Gary King, King(a)Harvard.Edu http://GKing.Harvard.Edu : : Center for Basic Research Direct (617) 495-2027 : : in the Social Sciences Assistant (617) 495-9271 : : 34 Kirkland Street, Rm. 2 HU-MIT DC (617) 495-4734 : : Harvard U, Cambridge, MA 02138 eFax (928) 832-7022 : On Fri, 1 Nov 2002, Thomas Flottemesch wrote: > Dear Sirs; > > Unfortunately, it appears Dr. King may be correct, and this is a program > error. As advised, I input the following from the command line: > > » proc loada; retp; endp; > > and encountered the following: > > (0) : error G0276 : 'loada' : Illegal use of reserved word > (0) : error G0055 : retp outside of procedure > (0) : error G0158 : endp without proc > > I also tried this (not that I expected any different): > > » proc loada; retp; endp; loada(4); > (0) : error G0276 : 'loada' : Illegal use of reserved word > (0) : error G0055 : retp outside of procedure > (0) : error G0158 : endp without proc > > > However, and this may be of interest to you, I reset Guass. Then, I did the > following: > > » loada(4); > (0) : error G0008 : '(4)' : Syntax error > » loada; (Although nothing happens at this command). > > Apparently, loada is some new command in Guass 5.0. However, it does not > exist in the reference, nor it is listed in the the Guass library file or > called in any existing procedures I know of. Given the many new import > options in Guass 5.0, I suspect Aptech may have reserved any load** > combination for future releases. But, that is pure speculation. > > Anyway, please keep me posted on any progress. I am very excited to start > using Amelia. > > My machine specifications are: > O/S: Windows XP > Ram: 128 > Guass Version: 5.0 > > Sincerly yours > > Thomas Flottemesch > tflottem(a)mail.wsu.edu

21 years, 5 months

Re: [clarify] [amelia] reading files under Amelia, and using imputed files with Clarify

by Carlos Elordi

21 years, 5 months

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Amelia November 2002