rolling/running statistics in javascript
npm install efficient-rolling-stats
returns function atEveryStep(number){ return result }
atEveryStep usualy has:
atEveryStep.setWindowSize(WindowSize)atEveryStep.reset()
returns function atEveryStep(number){ return result }
returns function atEveryStep(number){ return result }
returns function atEveryStep(number,index){ return result }
the index argument can be not continious like time in seconds or miliseconds to have minimum of last 5 minutes for example, or it can be 1 for increasing by 1 integers. index expected to be an increasing number.
returns function atEveryStep(number,index){ return result }
the index argument can be not continious like time in seconds or miliseconds
returns function atEveryStep(number,index){ return result }
the index argument can be not continious like time in seconds or miliseconds
this function is calculates average rate: SumDuringWindow/(LastIndex-FirstIndex) like in stocks total volume per minute in the last minute
if index is in miliseconds and you average frame size than it calculates rolling frames per millisecond input index can be a float number in terms of seconds to have frames per second and or in minutes to have per minute result. at the first time this function uses UsualIndexSkipBetweenOccations as sum devisor to calculate avarage. it does it by substructing from first time UsualIndexSkipBetweenOccations and calculating the delta so it is UsualIndexSkipBetweenOccations at the first time, and all times until window size is reached the input should be quite timely otherwise the result is delayed too much i think. maybe functions like this should be bound to a clock and work with event emiter. but i implemented it anyways.
returns function atEveryStep(number,index){ return result }
the index argument is a always rising number, can be float or integer, can be with skips. like time in seconds or miliseconds.
also atEveryStep has:
atEveryStep.setUsualIndexSkipBetweenOccations(UsualIndexSkipBetweenOccations)
example: count number of hits per second avarage during 10 seconds
var avg=stats.RollingSumPerIndex(
10, // like periods, - do avarage of the data during 10 periods
1) // generally i will feed the data every 1 period,
// if index of all data in the buffer is same then use this number to divide.
// to prevent divition by zero.
var rate= avg(
1, // the value is 1 to sum each time
Date.now()/1000 // period is in 1 second terms,
// so the sum will be divided by difference between end index from start index in seconds
)this function delayes the input by window size
returns function atEveryStep(number){ return result }
this function delayes the input by window size, using index
this function is similar to RollingxAvgPerIndex function
the input should be quite timely otherwise the result is delayed too much i think.
returns function atEveryStep(number,index){ return result }
the index argument can be not continious like time in seconds or miliseconds
also atEveryStep has:
atEveryStep.setUsualIndexSkipBetweenOccations(UsualIndexSkipBetweenOccations)
you should write a function like this for your self to choose which stats you want
this is a simple example function of how to combine multiple stats together
returns stats(number){ return result_object }
stats has:
stats.reset()
function source:
var Stats=require('efficient-rolling-stats');
function SimpleStats(size,delay)
{
var min=Stats.RollingMin(size)
,max=Stats.RollingMax(size)
,avg=Stats.RollingAvg(size)
,value_delay=Stats.Delay(delay)
function stats(n)
{
var o={}
o.min=min(n)
o.max=max(n)
o.avg=avg(n)
o.value_delay=value_delay(n)
return o;
}
stats.reset=function()
{
min.reset();
max.reset();
avg.reset();
value_delay.reset();
}
return stats;
}
anoher simple example function combines multiple stats together without value delay
returns stats(number){ return result_object }
function source:
var Stats=require('efficient-rolling-stats');
function SimpleStatsNoDelay(size)
{
var min=Stats.RollingMin(size)
,max=Stats.RollingMax(size)
,avg=Stats.RollingAvg(size)
function stats(n)
{
var o={}
o.min=min(n)
o.max=max(n)
o.avg=avg(n)
return o;
}
stats.reset=function()
{
min.reset();
max.reset();
avg.reset();
}
return stats;
}
this example contains many possibilities
returns stats(number,index){ return result_object }
function source:
var Stats=require('efficient-rolling-stats');
function AllStats(size,delay,timesize,usualtime,timedelay)
{
var min=Stats.RollingMin(size)
,max=Stats.RollingMax(size)
,avg=Stats.RollingAvg(size)
,avgtime=Stats.RollingAvg(size)
,stdev=Stats.RollingAvg(size)
,zavg=Stats.RollingAvg(size)
,tmin=vRollingMinIndex(timesize)
,tmax=Stats.RollingMaxIndex(timesize)
,tavg=Stats.RollingAvgIndex(timesize)
,tzavg=Stats.RollingAvgIndex(timesize)
,tstdev=Stats.RollingAvgIndex(timesize)
,tsum=Stats.RollingSumPerIndex(timesize,usualtime)// once in two seconds a value
,value_delay=Stats.Delay(delay) // because i can't move the indicators forewared but i can move the number backwards so it will match with the lagging indicators
,tvalue_delay=Stats.DelayIndex(timedelay,usualtime)
,index_delay=Stats.Delay(delay) // add the coresponding index to the delaied value, the other option is not to dalay anything and offset it the presentation
,tindex_delay=Stats.DelayIndex(timedelay,usualtime)
,prev=false
,count=0
,tcount=0;
function stats(n,t)
{
var o={}
o.min=min(n)
o.max=max(n)
o.avg=avg(n)
o.stdev=Math.sqrt(stdev(Math.pow(n-o.avg,2)))
o.z=o.stdev==0?0:(n-o.avg)/o.stdev
o.zavg=zavg(o.z)
o.tmin=tmin(n,t)
o.tmax=tmax(n,t)
o.tavg=tavg(n,t)
o.tsum=tsum(n,t)
o.tstdev=Math.sqrt(tstdev(Math.pow(n-o.tavg,2),t))
o.tz=o.tstdev==0?0:(n-o.tavg)/o.tstdev
o.tzavg=tzavg(o.tz,t)
if(prev===false) prev=t-usualtime; var delta=t-prev; prev=t; o.avgtime=avgtime(delta) // to have result in minutes
o.count=count;count++;// it is good ide to have count to skip the initial
o.tcount=tcount;tcount+=delta;
o.value_delay=value_delay(n);
o.tvalue_delay=tvalue_delay(n,t);
o.index_delay=index_delay(t);
o.tindex_delay=tindex_delay(t,t);
return o;
}
stats.reset=function()
{ // copy paste list from above regexp replace: search "=.+" replace with: ".reset\(\)" , replace the "," with " " - 2 spaces.
min.reset()
max.reset()
avg.reset()
avgtime.reset()
stdev.reset()
zavg.reset()
tmin.reset()
tmax.reset()
tavg.reset()
tzavg.reset()
tstdev.reset()
tsum.reset()
value_delay.reset()
tvalue_delay.reset()
index_delay.reset()
tindex_delay.reset()
prev=false;
count=0;
}
return stats;
}
var Stats=require('efficient-rolling-stats');
var Stats=require('efficient-rolling-stats');
//useful:
// sample 101 points and delay them by 50 points
// sample for 15 minutes and usually the input is every 15 seconds so the first input will be more or less not outlier,delay the timed input by 7.5 minutes
// var stats=Stats.AllStats(101,50,15,0.25,7.5)
//for testing:
var stats=Stats.AllStats(11,5,1,0.25,0.5) // sample for 15 minutes and usually the input is every 15 seconds so the first input will be more or less not outlier,delay the timed input by 7.5 minutes
setInterval(function(){stats(Math.random()*100,new Date().getTime()/60000)},1500) // input in minutes, than also the configuratin arguments can be in minutes
stats(Math.random()*100,new Date().getTime()/60000)
stats(Math.random()*100,new Date().getTime()/60000)
stats.reset();
simple examples:
min=Stats.RollingMin(4);// use generator configure window size to be 4
> min(3)
3
> min(3)
3
> min(3)
3
> min(2)
2
> min(4)
2
> min(4)
2
> min(4)
2
> min(4)
4
>
max=Stats.RollingMax(4);// use generator
max(1)
1
> max(1)
1
> max(3)
3
> max(2)
3
> max(2)
3
> max(2)
3
> max(2)
2
>
mint=Stats.RollingMinIndex(4000);// min values of last 4 seconds
> mint(3,new Date().getTime()+ 0);
3
> mint(4,new Date().getTime()+1000);
3
> mint(3,new Date().getTime()+2000);
3
> mint(5,new Date().getTime()+5000);
3
> mint(6,new Date().getTime()+10000);
5
> mint(7,new Date().getTime()+20000);
6
> mint(8,new Date().getTime()+30000);
7
var stats=Stats.AllStats(101,50,15*60000,0.25*60000,7.5*60000)
stats(Math.random()*100,new Date().getTime())
simple examples:
min=Stats.RollingMin(4);// use generator
> min(3)
3
> min(3)
3
> min(3)
3
> min(2)
2
> min(4)
2
> min(4)
2
> min(4)
2
> min(4)
4
>
max=Stats.RollingMax(4);// use generator
max(1)
1
> max(1)
1
> max(3)
3
> max(2)
3
> max(2)
3
> max(2)
3
> max(2)
2
>
mint=Stats.RollingMinIndex(4000);// min values of last 4 seconds
> mint(3,new Date().getTime()+ 0);
3
> mint(4,new Date().getTime()+1000);
3
> mint(3,new Date().getTime()+2000);
3
> mint(5,new Date().getTime()+5000);
3
> mint(6,new Date().getTime()+10000);
5
> mint(7,new Date().getTime()+20000);
6
> mint(8,new Date().getTime()+30000);
7