Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down at the end of May, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: st: Multiplying variables / Generating new variables after 'mi impute' - STATA 11


From   Steve Samuels <sjsamuels@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Multiplying variables / Generating new variables after 'mi impute' - STATA 11
Date   Wed, 28 Apr 2010 03:40:44 -0400

Bottom line: you must NOT multiply imputed variables, but you must
impute the product of variables as well as the individual terms,

Steve
On Wed, Apr 28, 2010 at 3:00 AM, Moses Lee <Moses.Lee@anu.edu.au> wrote:
> Hi STATA listers.
>
> I'm wondering if any if you could advise the following.
>
> I need to perform production function regression. This requires 2 stage.
>
> 1) Impute missing variables
> 2) Generate new variables - by multiplying two existing variables after
> imputing missing variables.
>
> I have tried running 'mi impute mvn' command. However, I realised the
> imputed values do not replace the missing values in the original variables.
> This becomes a problem if I need to estimate new variables which require a
> product of the original variables.
>
> An example: X and Y are variables that require imputing. After running the
> mi impute command, I need to 'gen (newvar)=X*Y. However, if the missing
> values in the existing X and Y are not replaced with the imputed values, I'm
> unable to generate a new variable.
>
> Can someone advise on how to replace missing values with imputed values? It
> seems impossible to generate new vars with the estimated imputed values.
>
> Many thanks.
> Moses
>
> *
> *   For searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
>



-- 
Steven Samuels
sjsamuels@gmail.com
18 Cantine's Island
Saugerties NY 12477
USA
Voice: 845-246-0774
Fax:    206-202-4783

*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/statalist/faq
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index