If both methods make sense and provide somewhat similar results, then that
is more then enough for me. The age variable is purely for control so a
reasonable confidence in the imputation, which definately follows from
what you propose here, is more then enough for me.
Again thanks for your replies and I hope not to have to bother any further.
"Met vriendelijke groeten" ;-)
Ren�
Maarten buis wrote:
> --- Ren� Wevers <[email protected]> wrote:
>> I also want to impute a discrete variable, namely the age of
>> companies in years (integers) with a maximum of 37 years (age has
>> only been measured as of 1967). The distribution is for this variable
>> is definately not normal, but it is not extremely skewed as well.
>> Can I manipulate my data such that I can apply standard (OLS)
>> regression to impute with -ice- or should I apply ordinal logistic
>> regression in this case?
>
> You could have a look at -gladder- which compares various
> transformations against a normal curve. For normality checking I prefer
> -hangroot-, downloadable from -scc-, over a histogram with a normal
> density plotted through it. (though I am not completely neutral as I am
> the author of -hangroot-.) I have also heard request for StataCorp to
> increase the number of categories allowed in -ologit- for just the kind
> of imputation analysis you are proposing, so there are other persons
> who think that it is reasonable to use -ologit- this way. I would say
> try to transform age into something more nearly Gaussian and use
> -regress- and use -ologit- and see if it makes a difference.
>
> Hope this helps,
> Maarten
>
> -----------------------------------------
> Maarten L. Buis
> Department of Social Research Methodology
> Vrije Universiteit Amsterdam
> Boelelaan 1081
> 1081 HV Amsterdam
> The Netherlands
>
> visiting address:
> Buitenveldertselaan 3 (Metropolitan), room Z434
>
> +31 20 5986715
>
> http://home.fsw.vu.nl/m.buis/
> -----------------------------------------
>
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