[Limdep Nlogit List] manually recognizing missing data

[William Greene]

Phil.  Try creating XREG = 0 first, so it exists with no missing values, then
execute the command I sent you.
/Bill

************************************************
Professor William Greene
Department of Economics
Stern School of Business
New York University
44 West 4th St., Rm. 7-78
New York, NY   10012
Ph. 212.998.0876
Fax. 212.995.4218
URL. http://www.stern.nyu.edu/~wgreene
Email. wgreene at stern.nyu.edu
************************************************

----- Original Message -----
From: "Philip A. Viton" <viton.1 at osu.edu>
Date: Tuesday, July 31, 2007 10:49 am
Subject: Re: [Limdep Nlogit List] manually recognizing missing data

> 
> Bill: many thanks; but: are you sure? I deleted the old xrej, then 
> copied your suggestion (changing the name of myvar, obviously) and 
> ran it. Result: xrej, when viewed in the data editor, still has a 
> blank (standing for -999, right?) in the position where the 
> variable 
> has something missing. I thought it might be sensitive to the skip 
> setting, so I deleted xrej, did noskip$ and tried again, with the 
> same result.  Am I forgetting something?
> 
> 
> 
> 
> 
> At 12:33 PM 7/31/2007, you wrote:
> >Phil.  For some purposes (like this one), you can treat the -999 
> as 
> >if it were a
> >real value.  Thus,
> >CREATE ; If ( myvar < -998 )  XREJ = 1 $
> >/Bill
> >
> >************************************************
> >Professor William Greene
> >Department of Economics
> >Stern School of Business
> >New York University
> >44 West 4th St., Rm. 7-78
> >New York, NY   10012
> >Fax. 212.995.4218
> >URL. http://www.stern.nyu.edu/~wgreene
> >Email. wgreene at stern.nyu.edu
> >************************************************
> >
> >----- Original Message -----
> >From: "Philip A. Viton" <viton.1 at osu.edu>
> >Date: Tuesday, July 31, 2007 10:21 am
> >Subject: [Limdep Nlogit List] manually recognizing missing data
> >
> > >
> > > Is there some create command which will allow you to create a
> > > variable which has (say) a 1 where another variable has missing
> > > data
> > > and zero otherwise? I've tried
> > >
> > > create;if (myvar=-999) xrej=1$
> > >
> > > but this seems to put a missing data code in positions where myvar
> > > has missing data!
> > >
> > > Thanks!
> > >
> > >
> > >
> > >
> > > ------------------------
> > > Philip A. Viton
> > > City Planning, Ohio State University
> > > 275 West Woodruff Avenue, Columbus OH 43210
> > > viton.1 at osu.edu
> > >
> > > _______________________________________________
> > > Limdep site list
> > > Limdep at limdep.itls.usyd.edu.au
> > > http://limdep.itls.usyd.edu.au
> > >
> >
> >_______________________________________________
> >Limdep site list
> >Limdep at limdep.itls.usyd.edu.au
> >http://limdep.itls.usyd.edu.au
> 
> 
> ------------------------
> Philip A. Viton
> City Planning, Ohio State University
> 275 West Woodruff Avenue, Columbus OH 43210
> viton.1 at osu.edu
> 
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