jitter()函数：对数值向量添加一个小的噪音量。
jitter(x,factor=1,amount=NULL)
·x：数值变量，需要加入噪音的数值向量；
·factor：数值型；
·amount：
例：
> round(jitter(c(rep(1,3),rep(1.2,4),rep(3,3))),3) [1] 0.995 1.017 1.032 1.201 1.200 1.164 1.180 3.023 2.976 3.030> jitter(rep(0,7))[1] -0.0054272884 -0.009010 0.0035989811 -0.0133819767 -0.0004372087[6] 0.0185353459 0.0031841173> jitter(rep(0,7))[1] 0.011631916 0.003153848 0.001674986 0.010502867 -0.014309786 -0.004305730 0.012148331> jitter(rep(10000,5))[1] 10179.605 9815.381 10067.678 9865.233 9846.532> jitter(rep(10000,5))[1] 9852.969 9956.410 9886.297 10078.813 9862.851> jitter(rep(10000,5))[1] 9936.206 9933.250 10053.980 9962.283 10067.200> jitter(rep(10000,5))[1] 10198.031 10161.518 9936.120 9902.919 9928.875> jitter(rep(10000,5))[1] 9997.306 9807.569 9914.049 10063.483 9851.937> jitter(rep(10000,5))[1] 9846.340 9812.892 9915.440 10031.004 9815.422> jitter(rep(10000,5))[1] 10090.507 10158.549 10095.456 9962.090 9832.906>
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