Amelia October 2002

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reading files under Amelia, and using imputed files with Clarify

by Carlos Elordi

21 years, 5 months

Re: questions on Amelia, Clarify and MI

by Gary King

The main rule is to include any variables in the imputation model that Amelia runs that you will use in any of your analysis models. that includes any (nonlinear) transformations of variables or lags or differences over time. So yes, you should include them. 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 Sun, 27 Oct 2002, Diogo Lemieszek Pinheiro wrote: > Dear Dr. King I am sorry to bother you again, but I have one more > question on AMELIA: In my model I am going to use both "level" variables > and change over time. SHould I use amelia on a dataset that only has the > level variables ot should I also include the change variables (in this > case, I have the ln of all variables, and change over time is simply > measured as t- t-1). Thanks Diogo L. Pinheiro > > Quoting Gary King <king(a)harvard.edu>: > > > On Tue, 22 Oct 2002, Diogo Lemieszek Pinheiro wrote: > > > > > Dear Dr. King, > > > First of all, let me thank you for creating AMELIA and distributing it > > free. It > > > is an excelent software. > > > I got a few questions, sorry if they seem trivial: > > > 1- When combining the results from the m datasets generated by Amelia, > > > how can I obtain the R squared and other "goodness of fit" indicators? > > > > the same way you combine any of the other quantities of interest. > > > > > 2- Should MI only be used for independent variables or t doesnt matter? > > > > you should use all your variables, x and y. it matters. > > > > > 3- Using clarify, do I have to use the estsimp command for every model I > > > am runnign from the imputed datasets? Using setx eliminate the need to > > > do that? If so, everytime I run stata again I have to use the estsimp > > > and then setx commands or is there a way to save it all? > > > > you can run amelia once and then do as many analysis models using the > > same imputed data sets. > > > > 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 : > > > > > > > Once again, I am sorry if the answer to those questions is obvious. I am > > just > > > starting to learn about MI... > > > Thanks in advance > > > Diogo L. Pinheiro > > > Graduate Student > > > Dept of SOciology > > > EMory University > > > > > > > > > > > > >

21 years, 6 months

Re: questions on Amelia, Clarify and MI

by Gary King

On Tue, 22 Oct 2002, Diogo Lemieszek Pinheiro wrote: > Dear Dr. King, > First of all, let me thank you for creating AMELIA and distributing it free. It > is an excelent software. > I got a few questions, sorry if they seem trivial: > 1- When combining the results from the m datasets generated by Amelia, > how can I obtain the R squared and other "goodness of fit" indicators? the same way you combine any of the other quantities of interest. > 2- Should MI only be used for independent variables or t doesnt matter? you should use all your variables, x and y. it matters. > 3- Using clarify, do I have to use the estsimp command for every model I > am runnign from the imputed datasets? Using setx eliminate the need to > do that? If so, everytime I run stata again I have to use the estsimp > and then setx commands or is there a way to save it all? you can run amelia once and then do as many analysis models using the same imputed data sets. 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 : > Once again, I am sorry if the answer to those questions is obvious. I am just > starting to learn about MI... > Thanks in advance > Diogo L. Pinheiro > Graduate Student > Dept of SOciology > EMory University > >

21 years, 6 months

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21 years, 6 months

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Amelia October 2002