R语言中统计频数分布

1、测试数据

test <- c(5.3, 5.6, 
          0.7, 0.6, 
          1.3, 
          2.8, 2.9, 2.1, 2.4,
          3.7, 
          4.2, 4.9, 4.7, 4.8, 4.2)

2、生成统计节点

breaks <- seq(0, 6, length.out = 7)   ## 生成统计节点
breaks
test.break = cut(test, breaks)        ##按照统计节点归类数据
test.break
class(test.break)
length(test.break)

3、统计频数频率、密度

freq <- table(test.break)
freq
densi <- freq / length(test)
densi

4、画直方图

a、频数图

hist(test, breaks = breaks,labels = T)

b、密度图

hist(test, breaks = breaks,labels = T, freq = F)