org.modeshape.jcr
Class RepositoryStatistics.Statistics

java.lang.Object
  org.modeshape.jcr.RepositoryStatistics.Statistics

All Implemented Interfaces:

Statistics

Enclosing class:

RepositoryStatistics

@Immutable
public static final class RepositoryStatistics.Statistics
extends Object
implements Statistics

The statistics for a sample of values. The statistics include the minimum, maximum, mean (average), variance and standard deviation.

The median value is not included in these statistics, since the median value cannot be rolled up given a series of statistics without having the original values. It is possible to compute the weighted median, but this loses effectiveness/value the more times it is rolled up.

Constructor Summary

protected

RepositoryStatistics.Statistics(int count, long max, long min, double mean, double variance)

Method Summary

int	getCount() Get the number of samples to which these statistics apply.
long	getMaximum() Get the maximum of the sampled values.
double	getMean() The mean (or average) of the sampled values.
long	getMinimum() Get the minimum of the sampled values.
double	getStandardDeviation() Get the standard deviation of the sampled values, which is a measure of how spread out the numbers are and is the square root of the variance.
double	getVariance() Get the variance of the sampled values, which is the average of the squared differences from the mean.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

RepositoryStatistics.Statistics

protected RepositoryStatistics.Statistics(int count,
                                          long max,
                                          long min,
                                          double mean,
                                          double variance)

Method Detail

getCount

public int getCount()

Description copied from interface: Statistics

Get the number of samples to which these statistics apply.

Specified by:

getCount in interface Statistics

Returns:

the number of samples; never negative

getMaximum

public long getMaximum()

Description copied from interface: Statistics

Get the maximum of the sampled values.

Specified by:

getMaximum in interface Statistics

Returns:

the maximum value

getMinimum

public long getMinimum()

Description copied from interface: Statistics

Get the minimum of the sampled values.

Specified by:

getMinimum in interface Statistics

Returns:

the minimum value

getMean

public double getMean()

Description copied from interface: Statistics

The mean (or average) of the sampled values. This is returned as a double to reduce the lost of precision.

Specified by:

getMean in interface Statistics

Returns:

the mean or average value

getVariance

public double getVariance()

Description copied from interface: Statistics

Get the variance of the sampled values, which is the average of the squared differences from the mean.

Specified by:

getVariance in interface Statistics

Returns:

the variance; never negative

getStandardDeviation

public double getStandardDeviation()

Description copied from interface: Statistics

Get the standard deviation of the sampled values, which is a measure of how spread out the numbers are and is the square root of the variance.

Specified by:

getStandardDeviation in interface Statistics

Returns:

the standard deviation; never negative

toString

public String toString()

Overrides:

toString in class Object