r语言中,画出了频率分布直方图,怎么在图上添加概率分布曲线答:可以用内置的graphic包来画,就是plot()和curve()也可以用ggplot2来画,后者更灵活.graphic 先生成一组随机数 x <- rnorm(2000)画频率直方图, 分30个bin hist(x, freq = F, breaks = 30)再画概率分布曲线 lines(density(x, bw=.5), col="red", lwd=2)2.ggplot2 准备工作, 把x设成一...
请教R语言中怎么用boot包,自助法估计样本中位数,以及此估计的方差和偏倚...答:我也想问下,这是这周BNU的非参作业吧= = comp <- sample(c(0, 5), size = 1000, prob = c(0.6, 0.4), replace = T)x=rnorm(1000, mean = ifelse(comp == 0, 0, 5), sd = ifelse(comp == 0, 1, 0.2^0.5))require(boot)median.boot<-function(x,ind){median(x...