com.pervasive.datarush.analytics.naivebayes

Class TargetStatistics

java.lang.Object

com.pervasive.datarush.analytics.naivebayes.TargetStatistics

public final class TargetStatistics
extends Object

PMML extension used to support numerical data. Corresponds to a "TargetStatistics" element that provides mean, stddev, and non-null count such that a predictor can predict using a Gaussian model. The following is an example of the extension:

 <BayesInput fieldName="continuous1">
    <Extension name="targetStatistics">
       <TargetStatistics value="bad" mean="7.5" nonNullCount="4" sum="30.0" sumSquares="230.0" variance="1.6666666666666667"/>
       <TargetStatistics value="good" mean="3.0" nonNullCount="5" sum="15.0" sumSquares="55.0" variance="2.5"/>
       <TargetStatistics value="ok" mean="11.0" nonNullCount="3" sum="33.0" sumSquares="365.0" variance="1.0"/>
    </Extension>
</BayesInput>
 

In PMML 4.2 or later a TargetValueStats element was added that should be used for continuous/numerical data. Currently we only support GaussianDistribution although the element also supports PoissonDistribution.

Field Summary

Fields

Modifier and Type	Field and Description
static String	ATT_MEAN
static String	ATT_VARIANCE

Constructor Summary

Constructors

Constructor and Description
TargetStatistics(double sum, double sumSquares, long nonNullCount) Creates a TargetStatistics object.

Method Summary

Modifier and Type	Method and Description
double	getMean() Returns the mean of the data values.
long	getNonNullCount() Returns the number of non-null data values.
double	getSum() Returns the sum of the data values.
double	getSumSquares() Returns the sum of the squares of the data values.
double	getVariance() Returns the sample variance of the data values.

Methods inherited from class java.lang.Object

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

Field Detail

ATT_MEAN

public static final String ATT_MEAN

See Also:

Constant Field Values

ATT_VARIANCE

public static final String ATT_VARIANCE

See Also:

Constant Field Values

Constructor Detail

TargetStatistics

public TargetStatistics(double sum,
                        double sumSquares,
                        long nonNullCount)

Creates a TargetStatistics object.

Parameters:

sum - The sum of the data values.

sumSquares - The sum of the squares of the data values.

nonNullCount - The number of non-null values.

Method Detail

getSum

public final double getSum()

Returns the sum of the data values.

Returns:

the sum of the data values.

getSumSquares

public final double getSumSquares()

Returns the sum of the squares of the data values.

Returns:

the sum of the squares of the data data values.

getNonNullCount

public long getNonNullCount()

Returns the number of non-null data values.

Returns:

the number of non-null data values.

getMean

public double getMean()

Returns the mean of the data values.

Returns:

the mean of the data values.

getVariance

public double getVariance()

Returns the sample variance of the data values.

Returns:

the sample variance of the data values.