Relogit

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Re: Clarify & Relogit

by Gary King

Thanks Bill & Lanny. I'm forwarding this to the Clarify and Relogit mailing lists so others might see too. 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 Thu, 15 May 2003, William Berry wrote: > Folks, > > As I noted in my previous email, Clarify and Relogit are designed to > simulate quantities of interest for case n from the estimation sample with > the command "setx [n]." As the exchange that follows shows, my colleague, > Lanny Martin, has devised a clever strategy for using Clarify and Relogit > to simulate quantities of interest for out-of-sample cases. Using Clarify > as an example, one appends the out of sample cases to the estimation data > set (adding a dummy variable which indicates whether a case is in the > estimation sample (insample=1) or out of sample (insample=0). Then one > uses the command > > estsimp modelname depvar indepvars if insample==1 > > to estimate one's model using just the cases for which insample equals > 1. Then one uses the command > > setx[#] > > where # is the observation number for a case for which insample equals 0. > > Perhaps you might consider noting this strategy in the next version of your > documentation for Clarify and Relogit. (While the "if" qualifier is > included in your description of the estsimp and relogit commands, its > usefulness for out-of-sample predictions is not immediately obvious.) > > This strategy also creates the option for users to input independent > variable values for a set of hypothetical cases by specifying values in an > input file. While for most applications, using setx commands to assign > independent variable values is simpler than inputting these values from a > file (through, for example, the command "setx mean"), there are other cases > where it would be simpler to use an input file... in which one can enter > just variable values in a spreadsheet and avoid the need to type many > commands with long lists of variable names. > > Bill > > >X-Sender: lanny@letter.net@mail.letter.net > >X-Mailer: QUALCOMM Windows Eudora Version 5.2.0.9 > >Date: Thu, 15 May 2003 09:54:28 -0400 > >To: William Berry <wberry(a)garnet.acns.fsu.edu> > >From: "Lanny W. Martin" <lmartin(a)garnet.acns.fsu.edu> > >Subject: Re: clarify > >X-Note: Report abuse to abuse(a)emailsrvr.com > >X-From: lmartin(a)garnet.acns.fsu.edu - user139.net031.fl.sprint-hsd.net > >([207.30.5.139]), outgoing 1. > >X-Note: HELOBOGUS, IPMX (-1) > > > > > >Bill, > > > >I just did a little experiment to see whether my suggestion yesterday > >would work, and the good news is that I think it does. I took two > >separate datasets that had the same explanatory variables (actually, I > >just created the two separate data sets by splitting my original data set > >into two files). Then, within each dataset I created a variable "sample" > >which took a value of 1 for all obs. in one dataset and 0 for all obs. in > >the other dataset. I then just appended one data set to the other. > > > >Next, using clarify, I ran: > > > >estsimp modelname variables if sample==1, > > > >which generated simulated parameters based on only my sample observations > >(i.e., the observations in the first of the two datasets that were > >appended). Then I just setx as usual with: > > > >setx [#], > > > >but the # I used was an observation that was NOT in the estimation sample > >(i.e., from the second of the two datasets that were appended). > > > >I checked everything to make sure that setx was using the correct > >observation, and it was. I also downloaded relogit (since I should > >probably have it anyway) and tried the same thing, and it works fine. > > > >So, solving the problem basically just boils down to appending the > >out-of-sample data to the sample data, doing relogit with an IF condition, > >and then doing setx to an out-of-sample observation. A little more > >brute-force than changing code, but it looks like everything worked correctly. > > > >Lanny > > > > > >At 05:09 PM 5/14/2003 -0400, you wrote: > >>Hi Lanny... > >> > >>The short answer is yes; you have it right. But just to be precise... > >> > >>It's actually RELOGIT that I'd be using to estimate the model. But > >>RELOGIT relies on the setx command in Clarify to specify a set of X > >>values for which predicted Pr(Y=1) is to be calculated. With the > >>existing setx command, one can set the values of the Xs to the X values > >>for observation number n in the estimation data set with the command > >>"setx [n]." I would be looking to modify the code (I presume in the > >>'setx.ado' file) so that the command "setx [n]" would set X values to the > >>X values of the nth case in a user-specified (non-estimation) data set... > >>or I suppose, leave setx alone but create another command, say "setnewx > >>[n]", that would do the same thing. > >> > >>Thanks for your willingness to take a quick look and see if what I want > >>to do might be doable in a "quick easy fix" to the Clarify code. > >> > >>Bill > >> > >>At 03:36 PM 5/14/2003 -0400, you wrote: > >> > >>>Hey Bill, > >>> > >>>I was going to sit down with clarify for a few minutes, but I wanted to > >>>make sure I understood your question first: So, what you want to do is > >>>estimate your model as usual in clarify using "estsimp" on one sample of > >>>data, then you want to set the x values equal to the values of the > >>>explanatory variables for observations that are outside your > >>>dataset. And after you do this, you would just generate whatever > >>>quantities of interest to you. Is that right? > >>> > >>>Lanny > >>> > >>>___________________________________ > >>>Lanny W. Martin > >>>Assistant Professor > >>>Department of Political Science > >>>Florida State University > >>>Tallahassee, FL 32306-2230 > >>> > >>>Email: lanny.martin(a)fsu.edu > >>>Web: http://garnet.acns.fsu.edu/~lmartin/ > >>> > >>>Phone: (850) 644-7328 > >>>Fax: (850) 644-1367 > >>>___________________________________ > >> > >> > >>**************************************************** > >>William D. Berry > >>Marian D. Irish Professor of Political Science > >>Department of Political Science > >>Florida State University > >>Tallahassee, FL 32306-2230 > >>e-mail: wberry(a)garnet.acns.fsu.edu > >>voice: 850-644-7321 FAX: 850-644-1367 > >>http://garnet.acns.fsu.edu/~wberry > >>**************************************************** > - relogit mailing list served by Harvard-MIT Data Center List Address: relogit(a)latte.harvard.edu Subscribe/Unsubscribe: http://lists.hmdc.harvard.edu/?info=relogit

21 years

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