现代统计图形 - 科学网—博客

60 第五章 图库
1 > par(mfrow = c(2, 2), mar = c(2, 3, 2, 0.5), mgp = c(2,
2 + 0.5, 0))
3 > data(geyser, package = "MASS")
4 > hist(geyser$waiting, main = "(1) freq = TRUE", xlab = "waiting")
5 > hist(geyser$waiting, freq = FALSE, xlab = "waiting",
6 + main = "(2) freq = FALSE")
7 > hist(geyser$waiting, breaks = 5, density = 10, xlab = "waiting",
8 + main = "(3) breaks = 5")
9 > hist(geyser$waiting, breaks = 40, col = "red", xlab = "waiting",
10 + main = "(4) breaks = 40")
Frequency
Frequency
0 10 20 30 40 50 60
0 20 40 60 80
(1) freq = TRUE
40 50 60 70 80 90 100 110
waiting
(3) breaks = 5
40 50 60 70 80 90 100 110
Density
Frequency
0.00 0.01 0.02 0.03 0.04
0 5 10 15 20 25
(2) freq = FALSE
40 50 60 70 80 90 100 110
waiting
(4) breaks = 40
40 50 60 70 80 90 100 110
图 5.1: 喷泉间隔时间直方图:(1)使用默认参数值(作频数图);(2)概
率密度直方图;(3)减小区间段数,直方图看起来更平滑(偏差大,方差
小);(4)增大区间段数,直方图更突兀(偏差小,方差大)。