Jason Osborne, Ph.D. wrote:
>
> I am trying to test a mediational model via multiple regression, to see
> of the beta for the relationship between X and Y is significantly
> reduced by covarying A. I need to test for significant differences
> between the beta X -> Y without A in the equation, and with A in the
> equation.
>
> These don't strike me as independent betas. Are they? I have skimmed
> through several regression texts, such as Cohen & Cohen and Pedhazur, as
> well as reading baron & Kenny's 1986 J Personality and SSocial Psych
> article. I cannot find a formula for testing differences between a
> particular regression weight in successive regression models.
>
> Any help is much appreciated!
>
> jason
>
IIRC Baron & Kenny give a procedure (not a single formula).
Glen
