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Re: st: mean, mode or median for missing values


From   Richard Williams <Richard.A.Williams.5@ND.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>, "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   Re: st: mean, mode or median for missing values
Date   Wed, 03 Feb 2010 00:03:03 -0500

At 11:11 PM 2/2/2010, Jet wrote:
Hi, all,

     My variable is measured by likert scales, and there are a few
missing values. I am thinking of using mean, mode or median to
substitute the missing values. Which is better given the ordinal
nature of the measurement?

The multiple imputation procedures in Stata 11 allow you to impute values for ordinal variables.

Consider too what you are going to do with this variable once you have got it. If you are going to use it as the dependent variable in an ologit analysis, that rules out using the mean. If you are going to use it as an independent variable, do you plan on treating it as continuous? If so, you wouldn't be the first person in the world to do so and plugging in a mean or an imputed regression estimate becomes more reasonable.


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Richard Williams, Notre Dame Dept of Sociology
OFFICE: (574)631-6668, (574)631-6463
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