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...e strategy, note that the area of the triangle formed by the points x_i = (x_i1,x_i2), x_j = (x_j1,x_j2), and theta = (theta_1,theta_2) is given by the determinant, | 1 1 1 | Delta(x_i, x_j, theta) = .5 |y_i1 yj1 theta_1|. |y_i2 yj2 theta_2| Expanding the determinant in the unknown parameters theta gives the l1 regression formulation. Remarkably, a result of Wilks says that if the call to rq() is replaced with a call to lm() you get the sample mean -- this gives an impressively inefficient least squares regression based...

...40892e-16 cc 6.661338e-16 0 dd 2.000000e+00 2 2 > Why using method "correlation" I don't get 1-person also person corr coef is between (-1,1). Also in help it is said >>'pearson': Also named "not centered Pearson" sum(x_i y_i) /[sum(x_i2) sum(y_i2)]. >>'correlation': Also named "Centered Pearson" 1 - corr(x,y). Maybe corr() is not Pearson correlation ?? Or maybe the data has to be scaled? Very confusing. Maybe somebody can help me with this. Also there is a sqrt missing in the person corr coef definition. Best, R...