uk.ac.starlink.ttools.mode

Class ColStats

java.lang.Object

uk.ac.starlink.ttools.mode.ColStats

public abstract class ColStats
extends Object

Accumulates statistics for the values in a given column. This object gets treated as a bean; its properties get turned into table columns. The property accessors (public get* methods) will return formatted strings based on the data which have been submitted to the acceptDatum(java.lang.Object) method.

Since:

16 Mar 2005

Author:

Mark Taylor (Starlink)

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ColStats(ColumnInfo colInfo) Constructs a new stats object.

Method Summary

Modifier and Type	Method and Description
abstract void	acceptDatum(Object value) Data are submitted to this statistics accumulator using this method.
abstract void	addStats(ColStats other) Adds the accumulated content of a second ColStats object to this one.
String	getColumn() Returns column name.
String	getGood() Returns formatted number of non-blank values in accepted data.
protected abstract long	getGoodCountValue() Returns the number of good values in the accumulated data.
String	getMax() Returns formatted maximum value of accepted data.
protected abstract Object	getMaximumValue() Returns the maximum of the accumulated data.
String	getMean() Returns formatted mean value of accepted data.
protected abstract double	getMeanValue() Returns the mean of the accumulated data.
String	getMin() Returns formatted minimum value of accepted data.
protected abstract Object	getMinimumValue() Returns the minimum of the accumulated data.
String	getStdDev() Returns formatted standard deviation of accepted data.
String	getVariance() Returns formatted variance of accepted data.
protected abstract double	getVarianceValue() Returns the variance of the accumulated data.
static ColStats	makeColStats(ColumnInfo info) Factory method which returns a new ColStats value suitable for a given ColumnInfo.

Methods inherited from class java.lang.Object

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

Constructor Detail

ColStats

protected ColStats(ColumnInfo colInfo)

Constructs a new stats object.

Parameters:

colInfo - info on the values which will be passed to the acceptDatum(java.lang.Object) method

Method Detail

getColumn

public String getColumn()

Returns column name.

Returns:

column

getMean

public String getMean()

Returns formatted mean value of accepted data.

Returns:

mean

getVariance

public String getVariance()

Returns formatted variance of accepted data.

Returns:

variance

getStdDev

public String getStdDev()

Returns formatted standard deviation of accepted data.

Returns:

standard deviation

getMin

public String getMin()

Returns formatted minimum value of accepted data.

Returns:

minimum

getMax

public String getMax()

Returns formatted maximum value of accepted data.

Returns:

maximum

getGood

public String getGood()

Returns formatted number of non-blank values in accepted data.

Returns:

good value count

acceptDatum

public abstract void acceptDatum(Object value)

Data are submitted to this statistics accumulator using this method.

Parameters:

value - data value to be accumulated into totals

addStats

public abstract void addStats(ColStats other)

Adds the accumulated content of a second ColStats object to this one.

Parameters:

other - compatible ColStats object

getMeanValue

protected abstract double getMeanValue()

Returns the mean of the accumulated data.

Returns:

mean

getVarianceValue

protected abstract double getVarianceValue()

Returns the variance of the accumulated data.

Returns:

variance

getMinimumValue

protected abstract Object getMinimumValue()

Returns the minimum of the accumulated data.

Returns:

min

getMaximumValue

protected abstract Object getMaximumValue()

Returns the maximum of the accumulated data.

Returns:

max

getGoodCountValue

protected abstract long getGoodCountValue()

Returns the number of good values in the accumulated data.

Returns:

good value count

makeColStats

public static ColStats makeColStats(ColumnInfo info)

Factory method which returns a new ColStats value suitable for a given ColumnInfo.

Parameters:

info - column description

Returns:

ColStats object which can accumulate stats for info