Sorry....a small clarification (based on off of-line question I got). By
"eq. 2-5c", I meant to say, see Equations 2-5c, which show that
consistency is not harmed by including an omitted nonsignificant regressor.
Best,
J.
__________________________________________
John Antonakis
Professor of Organizational Behavior
Director, Ph.D. Program in Management
Faculty of Business and Economics
University of Lausanne
Internef #618
CH-1015 Lausanne-Dorigny
Switzerland
Tel ++41 (0)21 692-3438
Fax ++41 (0)21 692-3305
http://www.hec.unil.ch/people/jantonakis
Associate Editor
The Leadership Quarterly
__________________________________________
On 07.03.2013 08:22, John Antonakis wrote:
Hi:
If you have a sufficiently large sample size and the regressors of
interest are significant predictors, then it is best to leave in the
controls; they do not harm but help consistency (even if only a tad).
What suffers is efficiency (standard errors) and this is amplified in
small sample size conditions. I would (mostly) always err on the side
of caution and include the controls. A couple of things to do before
considering dropping are: (a) to do a Wald test to test whether the
controls are simultaneously different from zero; (b) to do a Hausman
test comparing the consistent and efficient estimator or a Chow test
for the common regressors. See the first series of discussions (eq.
2-5c to see that consistency is never harmed even if a omitted
regressor is not a significant predictor: Antonakis, J., Bendahan, S.,
Jacquart, P., & Lalive, R. 2010. On making causal claims: A review and
recommendations. The Leadership Quarterly, 21(6): 1086-1120.
http://www.hec.unil.ch/jantonakis/Causal_Claims.pdf
Best,
J.
__________________________________________
John Antonakis
Professor of Organizational Behavior
Director, Ph.D. Program in Management
Faculty of Business and Economics
University of Lausanne
Internef #618
CH-1015 Lausanne-Dorigny
Switzerland
Tel ++41 (0)21 692-3438
Fax ++41 (0)21 692-3305
http://www.hec.unil.ch/people/jantonakis
Associate Editor
The Leadership Quarterly
__________________________________________
On 07.03.2013 08:07, James Bernard wrote:
Hi all,
I have a question which may sound too basic, but I wonder if anyone
could help:
