n X2i X3i
X2i X22i X2i X3i
X3i X2i X3i X32i
15 31,895 120
31,895 68,922.513 272,144
120 272,144 1240
29,135 62,905,821 247,934
944 APPENDIX C: THE MATRIX APPROACH TO LINEAR REGRESSION MODEL
Using the rules of matrix inversion given in Appendix B, one can see that
37.232491 —0.0225082 1.336707 —0.0225082 0.0000137 —0.0008319 1.336707 0.0008319 0.054034
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