SampleStatistic (Aspectran Core API Reference (6.0.3))

java.lang.Object
- com.aspectran.core.util.statistic.SampleStatistic

```
public class SampleStatistic
extends java.lang.Object
```
SampledStatistics
Provides max, total, mean, count, variance, and standard deviation of continuous sequence of samples.

Calculates estimates of mean, variance, and standard deviation characteristics of a sample using a non synchronized approximation of the on-line algorithm presented in Donald Knuth's Art of Computer Programming, Volume 2, Semi numerical Algorithms, 3rd edition, page 232, Boston: Addison-Wesley. that cites a 1962 paper by B.P. Welford that can be found by following Note on a Method for Calculating Corrected Sums of Squares and Products

This algorithm is also described in Wikipedia at Algorithms for calculating variance

Field Summary

Fields
Modifier and Type	Field	Description
`protected java.util.concurrent.atomic.AtomicLong`	`count`
`protected java.util.concurrent.atomic.LongAccumulator`	`max`
`protected java.util.concurrent.atomic.AtomicLong`	`total`
`protected java.util.concurrent.atomic.LongAdder`	`totalVariance100`

Constructor Summary

Constructors
Constructor Description

SampleStatistic()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`long`	`getCount()`
`long`	`getMax()`
`double`	`getMean()`
`double`	`getStdDev()`
`long`	`getTotal()`
`double`	`getVariance()`
`void`	`reset()`
`void`	`set(long sample)`
`java.lang.String`	`toString()`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

max

protected final java.util.concurrent.atomic.LongAccumulator max

total

protected final java.util.concurrent.atomic.AtomicLong total

count

protected final java.util.concurrent.atomic.AtomicLong count

totalVariance100

protected final java.util.concurrent.atomic.LongAdder totalVariance100

Constructor Detail
- SampleStatistic
```
public SampleStatistic()
```

Method Detail

reset
```
public void reset()
```

set
```
public void set(long sample)
```

getMax
```
public long getMax()
```

getTotal
```
public long getTotal()
```

getCount
```
public long getCount()
```

getMean
```
public double getMean()
```

getVariance
```
public double getVariance()
```

getStdDev
```
public double getStdDev()
```

toString
```
public java.lang.String toString()
```
Overrides:

toString in class java.lang.Object