data mandel; * From Fox, Applied Regression Analysis. ; * Mandel's Contrived Collinear Data ; * Source of Data: J. Mandel (1982), "Use of the singular value ; * decomposition in regression analysis." The American Statistician, 36: 15-24. ; input x1 x2 y ; cards; 16.85 1.46 41.38 24.81 -4.61 31.01 18.85 -0.21 37.41 12.63 4.93 50.05 21.38 -1.36 39.17 18.78 -0.08 38.86 15.58 2.98 46.14 16.3 1.73 44.47 ; run; proc means; run;