在使用loess函数过程中出现
1) residual stanadard eroror
2) equivalent number of parameters
3) trace of smoother matrix
这三个结果是如何计算的?有高手知道吗?
例如:
period <- 120
x <- 1:120
y <- sin(2*pi*x/period) + runif(length(x),-1,1)
y.loess <- loess(y ~ x, span=0.75, data.frame(x=x, y=y))
summary(y.loess)
结果:
Call:
loess(formula = y ~ x, data = data.frame(x = x, y = y), span = 0.75)
Number of Observations: 120
Equivalent Number of Parameters: 4.34
Residual Standard Error: 0.5721
Trace of smoother matrix: 4.73
Control settings:
normalize: TRUE
span : 0.75
degree : 2
family : gaussian
surface : interpolate cell = 0.2