# Re: st: RE: ice and constructed variables

 From sas146@columbia.edu To statalist@hsphsun2.harvard.edu Subject Re: st: RE: ice and constructed variables Date Wed, 01 Nov 2006 11:40:13 -0500

```Thanks

Quoting Maarten buis <maartenbuis@yahoo.co.uk>:

> S. Strauss is refering to an issue with multiple imputation and
> interaction variables (or other 'constructed variables').
> Consider an
> imputation model for price foreign rep78 and rep78Xforeign. You
> could
> use -ice- and impute all four variables, but that way you would
> get
> random draws for the variable rep78 and different random draws
> for
> rep78Xforeign. Better would be to get random draws for rep78 and
> use
> those to create rep78Xforeign. This can be done with -ice- using
> the eq
> and passive options. S. Strauss can read how to do that in
> (Royston
> 2005)
>
> Patrick Royston (2005) "Multiple Imputation of missing values:
> update"
> The Stata Journal, 5(2), pp. 188-201.
>
> HTH,
> Maarten
>
>
>
> --- Nick Cox <n.j.cox@durham.ac.uk> wrote:
>
> > I guess that you shouldn't represent it in -ice-
> > at all. Imputing the components is one thing. Producing
> > a construct downstream of the imputation is another.
> > Otherwise, at best, it is hard to disentangle what
> > to blame for what.
> >
> > In any case, what is your formula here? Dying to know,
> >
> > Nick
> > n.j.cox@durham.ac.uk
> >
> > sas146@columbia.edu
> >
> > > I'm trying to undertake multiple imputation with "ice" and
> have a
> > > questions about how to account for the relationship between a
> > > constructed variable and its multiple component parts.  I'm
> aware
> > > that I should use "passive" and, at times, "eq", but not
> exactly
> > > sure of how. For example, I have created a variable I'll call
> > > "sexuality" from the "gender" variable (0,1) and "attracted
> to
> > > males" (0,1) and "attracted to females" (0,1).  How would I
> > > represent this in "ice"?  I'd appreciate some help figuring
> this
> > > out.
> > > Thanks
> > > S. Strauss
> > >
>
>
> -----------------------------------------
> Maarten L. Buis
> Department of Social Research Methodology
> Vrije Universiteit Amsterdam
> Boelelaan 1081
> 1081 HV Amsterdam
> The Netherlands
>
> Buitenveldertselaan 3 (Metropolitan), room Z434
>
> +31 20 5986715
>
> http://home.fsw.vu.nl/m.buis/
> -----------------------------------------
>
>
>
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```