r语言中,如何对混频midas模型做非线性最小二乘估计,估计系数阿尔法和贝塔,请举例说明
eq_r <- midas_r(y ~ trend + mls(x, 0:7, 4, nealmon) + mls(z, 0:16, 12, nealmon), start = list(x = c(1,-0.5), z = c(2, 0.5, -0.1))) summary(eq_r)