如何在 R 中从直方图中提取频率值?
当我们创建一个直方图并将其保存在一个对象名称中时,我们可以通过调用该对象来提取中值或分段的频率作为计数。我们可以认为对象获得的中值或分段是与在直方图上绘制频率的实际值相对应的。
示例
> x1<-rpois(1000,5) > Histogram1<-hist(x1) > Histogram1
输出
$breaks [1] 0 1 2 3 4 5 6 7 8 9 10 11 12 13 $counts [1] 45 82 150 156 172 142 113 62 43 20 9 5 1 $density [1] 0.045 0.082 0.150 0.156 0.172 0.142 0.113 0.062 0.043 0.020 0.009 0.005 [13] 0.001 $mids [1] 0.5 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5 10.5 11.5 12.5 $xname [1] "x1" $equidist [1] TRUE attr(,"class") [1] "histogram"
> x2<-rpois(100000,5) > Histogram2<-hist(x2) > Histogram2
输出
$breaks [1] 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 $counts [1] 4068 8293 14117 17627 17451 14671 10471 6604 3545 1793 810 322 [13] 152 49 12 10 4 1 $density [1] 0.04068 0.08293 0.14117 0.17627 0.17451 0.14671 0.10471 0.06604 0.03545 [10] 0.01793 0.00810 0.00322 0.00152 0.00049 0.00012 0.00010 0.00004 0.00001 $mids [1] 0.5 1.5 2.5 3.5 4.5 5.5 6.5 7.5 8.5 9.5 10.5 11.5 12.5 13.5 14.5 [16] 15.5 16.5 17.5 $xname [1] "x2" $equidist [1] TRUE attr(,"class") [1] "histogram"
> x3<-runif(10000,5,10) > Histogram3<-hist(x3) > Histogram3
输出
$breaks [1] 5.0 5.5 6.0 6.5 7.0 7.5 8.0 8.5 9.0 9.5 10.0 $counts [1] 1062 1037 959 987 1010 970 942 1019 1045 969 $density [1] 0.2124 0.2074 0.1918 0.1974 0.2020 0.1940 0.1884 0.2038 0.2090 0.1938 $mids [1] 5.25 5.75 6.25 6.75 7.25 7.75 8.25 8.75 9.25 9.75 $xname [1] "x3" $equidist [1] TRUE attr(,"class") [1] "histogram"
> x4<-rnorm(10000,5,10) > Histogram4<-hist(x4) > Histogram4
输出
$breaks [1] -35 -30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 $counts [1] 1 15 47 155 459 939 1458 1924 1922 1511 938 406 153 55 13 [16] 1 3 $density [1] 0.00002 0.00030 0.00094 0.00310 0.00918 0.01878 0.02916 0.03848 0.03844 [10] 0.03022 0.01876 0.00812 0.00306 0.00110 0.00026 0.00002 0.00006 $mids [1] -32.5 -27.5 -22.5 -17.5 -12.5 -7.5 -2.5 2.5 7.5 12.5 17.5 22.5 [13] 27.5 32.5 37.5 42.5 47.5 $xname [1] "x4" $equidist [1] TRUE attr(,"class") [1] "histogram"
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