样本分配
占用大量且连续的数据流，并且连续仅保留减少的近似值
小，简单，无依赖性
••••• •
例子
import Recorder from 'sample-distribution'
// recorder with 5 retained samples
var recorder = new Recorder ( 5 )
[ 5 , 3 , 6 , 2 , 7 , 1 , 8 ] . forEach ( recorder . push , recorder )
console . log ( 'minimum:' , recorder . Q ( 0 ) ) // minimum:0
console . log ( 'median:' , recorder . Q ( 0.5 ) ) // median:4
console . log ( 'maximum:' , recorder
