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Re: st: What multiple regression model for extreme distributions


From   Ronan Conroy <[email protected]>
To   "[email protected]" <[email protected]>
Subject   Re: st: What multiple regression model for extreme distributions
Date   Tue, 2 Feb 2010 18:29:53 +0000

On 2 Feabh 2010, at 15:09, muhammed abdul khalid wrote:

I have a household income survey data ( 38,000 observations), and my
problem is doing a multiple regression on saving ( independent var) to
ethnicity/strata/employment
etc( dependent var).

The problem is this : 70% of my observation for the value of saving is
zero.

Then this sounds like a two-stage model. The first model predicts whether the family saves or not, the second predicts how much they save, conditional on their saving at all. I would be wary of predicting everything in a single model - the determinants of how much may not be the same as the determinants of whether.


Ronan Conroy
=================================

[email protected]
Royal College of Surgeons in Ireland
Epidemiology Department,
Beaux Lane House, Dublin 2, Ireland
+353 (0)1 402 2431
+353 (0)87 799 97 95
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http://rcsi.academia.edu/RonanConroy

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