"NLS: Nonlinear Least-Squares Regression."

Welsch, Roy E. TROLL Documentation Series, M.I.T. Information Processing Center. 1981.

"Regression Sensitivity Analysis and Bounded-Influence Estimation."

Welsch, Roy E. In Evaluation of Econometric Models, edited by James Ramsey and Jan Kmenta, 153-167. New York, NY: Academic Press, 1980.

"Robust and Bounded-Influence Regression."

Roy E. Welsch. In Proceedings of the 42nd Session of the International Statistical Institute, Voorburg, Netherlands: December 1980.

Regression Diagnostics: Identifying Influential Data and Sources of Collinearity.

Belsley, David, Edwin Kuh and Roy E. Welsch. New York, NY: John Wiley and Sons, Inc., 1980.

"Econometric Models and Their Assessment for Policy: Some New Diagnostics Applied to the Translog Energy Demand in Manufacturing."

Roy E. Welsch and Edwin Kuh. In Proceedings of the Workshop on Validation and Assessment Issues of Energy Models, edited by S. Gass. Washington, DC: January 1980.

"Regression Diagnostics for Desktop Computers."

Roy E. Welsch. In COMPSTAT 1980: Proceedings in Computational Statistics, edited by D. Wishart and M. M. Barritt. Heidelberg, Germany: January 1980.