computes initial value of the coefficients, beta0, and the S robust covariance as initial value of the covariance matrix delta=

computes initial value of the coefficients, beta0, and the S robust covariance as initial value of the covariance matrix delta=

initial_d0(X, aux, efficiency = 0.85)

Arguments

X	data matrix
aux	constanst for both rho functions
efficiency	optionally the efficiency of the univariate estimate