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st: RE: Imputed Missing Values with Uvis

From   "Nick Cox" <>
To   <>
Subject   st: RE: Imputed Missing Values with Uvis
Date   Thu, 24 Feb 2005 22:03:17 -0000

You seem surprised at this.

If you don't know -x1-, you cannot 
predict -y- from -x1 x2 x3-; and 
so on. 

If you do know -y- you don't need 
to impute it. 


Quang Nguyen
> I am exploring the possibility of imputing the missing values by using
> procedures such as Uvis or Mvis. One thing, I notice is the following:
> Suppose, I have the command: _Uvis_   _regression_  y x1 x2 x3 
> Where y is the variable whose missing values will be imputed as a
> predictor from the regression equation : y = a0+ a1*x1 +a2*x2 +a3*x3
> As such, if any one of x1, x2, x3 has missing value then the imputed
> value of y is missing despite that the value of orginal y is observed.

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