View source: R/l2e_regression_convex.R
l2e_regression_convex | R Documentation |
l2e_regression_convex
performs L2E convex regression via block coordinate descent
with proximal gradient for updating both beta and tau.
l2e_regression_convex(y, b, tau, max_iter = 100, tol = 1e-04, Show.Time = TRUE)
y |
Response vector |
b |
Initial vector of regression coefficients |
tau |
Initial precision estimate |
max_iter |
Maximum number of iterations |
tol |
Relative tolerance |
Show.Time |
Report the computing time |
Returns a list object containing the estimates for beta (vector) and tau (scalar), the number of outer block descent iterations until convergence (scalar), and the number of inner iterations per outer iteration for updating beta and tau (vectors)
set.seed(12345) n <- 200 tau <- 1 x <- seq(-2, 2, length.out=n) f <- x^4 + x y <- f + (1/tau) * rnorm(n) ## Clean data example plot(x, y, pch=16, cex.lab=1.5, cex.axis=1.5, cex.sub=1.5, col='gray') lines(x, f, lwd=3) tau <- 1 b <- y sol <- l2e_regression_convex(y, b, tau) plot(x, y, pch=16, cex.lab=1.5, cex.axis=1.5, cex.sub=1.5, col='gray') lines(x, f, lwd=3) cvx <- fitted(cobs::conreg(y, convex=TRUE)) lines(x, cvx, col='blue', lwd=3) lines(x, sol$beta, col='dark green', lwd=3) ## Contaminated data example ix <- 0:9 y[45 + ix] <- 14 + rnorm(10) plot(x, y, pch=16, cex.lab=1.5, cex.axis=1.5, cex.sub=1.5, col='gray') lines(x, f, lwd=3) tau <- 1 b <- y sol <- l2e_regression_convex(y, b, tau) plot(x, y, pch=16, cex.lab=1.5, cex.axis=1.5, cex.sub=1.5, col='gray') lines(x, f, lwd=3) cvx <- fitted(cobs::conreg(y, convex=TRUE)) lines(x, cvx, col='blue', lwd=3) lines(x, sol$beta, col='dark green', lwd=3)
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