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Evaluating the Effect of Incorrect Specification of a Regression Model, Part 2: Further Example and Discussion

Summary: This is the second part of a two-part paper on the effect of incorrectly specifying a regression model. The first five sections of the paper appeared in the last issue of this journal (April 1978, Vol. 10, No. 2). These sections dealt with statistical models, model underspecification and overspecification, and bias and root mean square error. A new computer program, EXPLOR II, which permits evaluation of the consequences of model misspecification, was briefly described. Finally, the concepts were illustrated with an example involving a rubber tear-strength test program. In this part of the paper, the concepts are applied to evaluating the alias structure of fractional factorial test plans. Various effects of model underspecification are described and some concluding remarks are made. The formulae that are used to evaluate bias are given in the Appendix.

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  • Topics:
  • Keywords: Bias,Misspecification
  • Author: Hahn, Gerald J.; Feder, Paul I.; Meeker Jr., William Q.
  • Journal: Journal of Quality Technology