如何找到大于或等于R中某个值的频率?
在数据分析中,我们经常需要查找小于,小于,大于或大于等于的值,以将它们与某个阈值进行比较。有时我们还需要这些值的频率。因此,我们可以将sum函数用于此目的。例如,如果向量x具有10个整数值,则要检查其中有多少个整数值大于或等于10,我们可以使用命令sum(x> = 10)。
例1
x1<−rpois(150,5)输出结果x1
[1] 4 5 3 3 5 4 9 4 7 1 6 15 3 3 2 3 5 5 3 6 9 6 5 2 1[26] 4 2 1 6 3 8 2 6 7 6 5 5 7 6 3 3 4 5 3 8 11 0 3 7 5
[51] 5 4 7 3 4 6 4 4 9 8 3 6 10 4 3 7 3 6 5 4 7 5 3 1 3
[76] 6 4 5 2 11 5 6 5 2 4 3 6 8 3 5 8 8 2 7 10 5 4 4 3 3
[101] 8 7 5 7 3 5 5 3 9 3 3 8 5 5 5 5 7 5 7 5 4 7 4 8 5
[126] 4 4 7 7 4 2 1 7 7 4 6 7 6 6 3 2 3 7 4 3 6 8 4 3 8
示例
sum(x1>=5)输出结果
[1] 83
例2
x2<−rpois(150,2)输出结果x2
[1] 0 6 3 2 3 2 1 1 0 3 0 5 2 0 3 1 3 1 2 3 2 3 2 5 0 3 0 3 0 3 3 1 2 3 3 1 3[38] 2 2 2 2 2 2 1 3 2 0 2 1 4 2 1 1 2 4 0 2 2 1 0 1 4 2 1 2 4 1 2 0 3 2 2 1 0
[75] 0 3 1 2 1 1 4 4 1 2 2 0 1 3 3 5 5 1 5 2 1 2 2 3 3 3 2 3 2 1 2 1 5 0 3 2 1
[112] 3 2 1 3 4 2 4 3 4 1 3 4 1 1 1 2 3 1 3 2 0 2 2 2 2 3 2 3 1 1 4 1 5 3 3 1 1
[149] 0 0
示例
sum(x2>=5)输出结果
[1] 8
范例3
x3<−round(rnorm(100),2)输出结果x3
[1] −1.45 0.32 −0.04 0.96 0.73 −0.23 −0.74 0.53 −1.78 2.12 1.52 1.51[13] 1.98 −0.57 −0.88 −2.06 0.44 −0.33 1.03 1.63 1.55 0.34 −0.17 −0.79
[25] 0.68 −0.64 −0.82 1.04 −1.02 0.05 1.07 −1.50 −2.70 0.99 0.07 −0.97
[37] −0.08 −1.32 0.51 0.01 0.92 −1.11 −0.32 1.05 0.19 0.49 −0.06 1.38
[49] 0.04 0.06 1.57 −0.09 1.35 0.83 0.54 1.70 −1.36 0.31 −1.53 −0.07
[61] 0.07 0.61 0.13 −0.82 −0.24 −1.40 0.71 −0.77 −0.08 −0.06 0.10 −1.07
[73] −0.75 0.29 −0.11 −0.58 −1.01 0.06 −1.06 0.32 −0.21 −0.61 0.98 0.12
[85] −0.58 −0.56 1.11 −0.29 0.21 0.53 −0.29 1.13 0.03 −0.04 1.85 −1.22
[97] −0.23 −1.45 −1.68 0.27
示例
sum(x3>=0.25)输出结果
[1] 38
例子4
x4<−rnorm(100,10,3)输出结果x4
[1] 7.597491 7.949568 8.126105 7.463872 6.617113 8.354158 8.803647输出结果[8] 9.424731 14.517557 9.776073 14.094525 14.051761 6.694324 10.161498
[15] 6.684266 8.487643 13.053916 8.888167 8.633980 12.356086 11.405917
[22] 10.707835 8.051093 2.950978 12.248564 7.022646 10.238748 13.662946
[29] 10.866488 7.355724 16.510802 13.140203 7.632991 8.343411 7.714010
[36] 10.462814 6.513682 5.024443 9.283309 9.174802 10.994014 11.732416
[43] 10.227234 7.312629 8.476452 9.001631 11.709300 9.743112 12.810862
[50] 12.298896 9.539788 13.943619 11.345357 9.963804 13.229894 5.094773
[57] 10.099810 7.648431 11.704927 8.428569 4.880670 14.992570 10.566891
[64] 12.549172 13.232136 4.453650 8.361071 11.638091 12.893968 8.072887
[71] 14.663789 7.899722 10.907741 4.416071 12.089033 14.545859 19.397030
[78] 6.023658 8.473864 8.215500 2.549976 6.273917 17.355490 7.472054
[85] 11.106132 9.293263 10.283507 12.538926 17.778788 12.705169 7.679622
[92] 10.750032 6.393891 12.565089 5.556969 12.610292 17.343324 15.736677
[99] 9.505158 11.343209
sum(x4>=10)输出结果
[1] 49
范例5
x5<−runif(100,2,5)输出结果x5
[1] 3.636398 3.898034 4.296205 2.249604 2.379428 3.233782 4.798916 3.150175[9] 3.526049 3.318808 2.092628 3.640334 4.776549 2.145952 4.751566 3.429172
[17] 2.197853 2.783967 2.018186 2.002520 2.579248 3.083350 3.924225 3.271760
[25] 2.556557 2.416284 3.140659 4.329581 2.354663 2.951233 2.386200 3.322287
[33] 3.178507 2.592847 4.553768 4.011444 2.467380 2.325412 3.087714 2.945327
[41] 4.635870 3.877260 2.586140 3.005279 4.753057 3.766665 2.614960 3.958394
[49] 2.167482 3.436171 4.089592 2.031541 3.491617 4.199338 2.635759 3.255678
[57] 3.798499 3.738574 2.895809 3.674032 4.137452 4.003497 2.231915 4.378317
[65] 2.938005 3.695278 3.475259 3.673781 3.564739 4.816054 3.876752 2.127490
[73] 2.341472 4.316100 3.912831 4.377490 3.600701 3.091522 3.442127 2.196780
[81] 3.584403 3.917059 3.135924 3.425142 3.590885 3.860618 2.778151 2.195585
[89] 3.199603 2.247892 4.830438 4.290870 2.662993 2.749634 4.931301 2.567786
[97] 3.551937 4.484705 2.348458 2.189373
示例
sum(x5>=4)输出结果
[1] 21
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