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SimpleStats

public class SimpleStats
extends Object

java.lang.Object
↳	com.android.tradefed.util.SimpleStats

A small utility class that calculates a few statistical measures given a numerical dataset. The values are stored internally as Doubles.

Summary

Public constructors
`SimpleStats()`

Public methods
`void`	`add(double meas)` Add a measurement to the dataset.
`void`	`addAll( c)` Add a number of measurements to the dataset.
	`getData()` Retrieve the dataset.
`boolean`	`isEmpty()` Check if the dataset is empty.
`Double`	`max()` Return the maximum value in the dataset, or `null` if the dataset is empty.
`Double`	`mean()` Calculate and return the mean of the dataset, or `null` if the dataset is empty.
`Double`	`meanOverOneStandardDeviationRange()` return the average value of the samples that are within one stdev e.g 2.55 50.3 50.4 48.5 50.1 29.8 30 46 48 49 average: 40.45, stdev: 15.54 average of the values within one stdev is: 44.67
`Double`	`median()` Calculate and return the median of the dataset, or `null` if the dataset is empty.
`Double`	`min()` Return the minimum value in the dataset, or `null` if the dataset is empty.
`int`	`size()` Check how many elements are in the dataset.
`Double`	`stdev()` Return the standard deviation of the dataset, or `null` if the dataset is empty.

Public constructors

SimpleStats

public SimpleStats ()

Public methods

add

public void add (double meas)

Add a measurement to the dataset.

Parameters
`meas`	`double`

addAll

public void addAll ( c)

Add a number of measurements to the dataset.

Parameters
`c`

Throws
`NullPointerException`	if the collection contains any `null` elements

getData

public  getData ()

Retrieve the dataset.

Returns

isEmpty

public boolean isEmpty ()

Check if the dataset is empty.

Returns
`boolean`

max

public Double max ()

Return the maximum value in the dataset, or null if the dataset is empty.

Returns
`Double`

mean

public Double mean ()

Calculate and return the mean of the dataset, or null if the dataset is empty.

Returns
`Double`

meanOverOneStandardDeviationRange

public Double meanOverOneStandardDeviationRange ()

return the average value of the samples that are within one stdev e.g 2.55 50.3 50.4 48.5 50.1 29.8 30 46 48 49 average: 40.45, stdev: 15.54 average of the values within one stdev is: 44.67

Returns
`Double`

median

public Double median ()

Calculate and return the median of the dataset, or null if the dataset is empty.

Returns
`Double`

min

public Double min ()

Return the minimum value in the dataset, or null if the dataset is empty.

Returns
`Double`

size

public int size ()

Check how many elements are in the dataset.

Returns
`int`

stdev

public Double stdev ()

Return the standard deviation of the dataset, or null if the dataset is empty.

Note that this method calculates the population standard deviation, not the sample standard deviation. That is, it assumes that the dataset is entirely contained in the SimpleStats instance.

Returns
`Double`