"The Hat Matrix in Regression and ANOVA."

Hoaglin, David C. and Roy E. Welsch. The American Statistician Vol. 32, No. 1 (1978): 17-22.

"Discussion of 'Statisticians Can Matter' by Harry V. Roberts."

Welsch, Roy E. The American Statistician Vol. 32, No. 2 (1978): 52-53.

"Finding Influential Subsets of Data in Regression Models."

Roy E. Welsch and Steve Peters. In Proceedings of the Eleventh Interface Symposium on Computer Science and Statistics, edited by A. R. Gallant and T. M. Gerig. Raleigh, NC: March 1978.

"TROLL Experimental Programs, SENSSYS (Model Sensitivity Analysis)."

Welsch, Roy E. and Steve Peters. Computing Documentation. M.I.T. Information Processing Center.

"Discussion of 'Do Robust Estimators Work with Real Data?' by Stephen M. Stigler."

Welsch, Roy E. Annals of Statistics Vol. 5, (1977): 1095-1096.

"Nonlinear Statistical Data Analysis."

Roy E. Welsch. In Proceedings of the Tenth Interface Symposium on Computer Science and Statistics, edited by D. Fife and D. Hogben. Washington, DC: December 1977.