library(mboost)
> NMSE=rep(0,5);NMSE0=NMSE
> for(i in 1:5){m=zz1[zz2==i]
+ B1=mboost(y~btree(x1)+btree(x2)+btree(x3)+btree(x4)+btree(x5)+btree(x6),data=w[-m,])
+ y0=predict(B1,w[-m,])
+ y1=predict(B1,w[m,])
+ NMSE0[i]=mean((w$y[-m]-y0)^2)/mean((w$y[-m]-mean(w$y[-m]))^2)
+ NMSE[i]=mean((w$y[m]-y1)^2)/mean((w$y[m]-mean(w$y[m]))^2)}


Loading required package: party
Error in btree(x1) : cannot load ‘party’
In addition: Warning message:
In library(package, lib.loc = lib.loc, character.only = TRUE, logical.return = TRUE,  :
  there is no package called ‘party’

这个party包是什么？mboost里面的吗？我的语句里也没有关于party的呀