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Re: st: DFBETA for constant

From   Weihua Guan <[email protected]>
To   [email protected]
Subject   Re: st: DFBETA for constant
Date   Fri, 09 Aug 2002 14:42:56 -0500

--Roger Harbord <[email protected]> asked early this week why
-dfbeta or -predict, dfbeta()- does not work for the constant term.

After exchanging emails with Roger, I privately sent him a do-file to
calculate the DFBETAs for the constant term based on a draft by Bobby
Gutierrez.  Now I converted the do-file to an revised version of -dfbeta-,
called -dfbeta2-.  If anyone is interested, it can be downloaded by:

. net from

The syntax is basically the same as -dfbeta-, where you can use:

. dfbeta2 [varlist]

to obtain the DFBETAs for the variables specified.  I also added two options:

1) -double- requests that the calculated data will be stored as double
precision.  The default is float.

2) -constant- requests the DFBETAs for the constant term to be calculated.

Some examples:

. dfbeta2, constant		/* for the constant term only */

. dfbeta2 weight, constant	/* for weight and constant term */

. dfbeta2			/* for every variable in previous model
				   including the constant term */

Weihua Guan <[email protected]>
Stata Corp.
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