predictor variables: first column is hardness, second column is tensile strength 45.00 162.00 55.00 233.00 61.00 232.00 66.00 231.00 71.00 231.00 71.00 237.00 81.00 224.00 86.00 219.00 53.00 203.00 60.00 189.00 64.00 210.00 68.00 210.00 79.00 196.00 81.00 180.00 56.00 200.00 68.00 173.00 75.00 188.00 83.00 161.00 88.00 119.00 59.00 161.00 71.00 151.00 80.00 165.00 82.00 151.00 89.00 128.00 51.00 161.00 59.00 146.00 65.00 148.00 74.00 144.00 81.00 134.00 86.00 127.00 response variable: abrasion loss 372.00 206.00 175.00 154.00 136.00 112.00 55.00 45.00 221.00 166.00 164.00 113.00 82.00 32.00 228.00 196.00 128.00 97.00 64.00 249.00 219.00 186.00 155.00 114.00 341.00 340.00 283.00 267.00 215.00 148.00