com.sparsity.sparksee.gdb.AttributeStatistics Class Reference

Attribute statistics class. More...

Public Member Functions
com.sparsity.sparksee.gdb.Value	GetMin ()
	Gets the minimum existing value (BASIC statistics).
int	GetMinLengthString ()
	Gets the minimum length.
double	GetVariance ()
	Gets the variance.
com.sparsity.sparksee.gdb.Value	GetMode ()
	Gets the mode.
long	GetNull ()
	Gets the number of objects NULL a Value (BASIC statistics).
long	GetDistinct ()
	Gets the number of distinct values (BASIC statistics).
double	GetMean ()
	Gets the mean or average.
com.sparsity.sparksee.gdb.Value	GetMax ()
	Gets the maximum existing value (BASIC statistics).
double	GetMedian ()
	Gets the median.
long	GetTotal ()
	Gets the number of objects with a non-NULL Value (BASIC statistic).
int	GetMaxLengthString ()
	Gets the maximum length.
double	GetAvgLengthString ()
	Gets the average length.
long	GetModeCount ()
	Gets the number of objects with a Value equal to the mode.

Detailed Description

Attribute statistics class.

It contains statistic data about an attribute.

Some fields are valid just for numerical attributes and others just for string attributes. Also, some statistics are considered BASIC because computing them do not require to traverse all the different values of the attribute. For each getter method the documentation tells if the statistic is BASIC or not. See the Graph class method getAttributeStatistics or check out the SPARKSEE User Manual for more details on this.

Author

Sparsity Technologies http://www.sparsity-technologies.com

Member Function Documentation

double com.sparsity.sparksee.gdb.AttributeStatistics.GetAvgLengthString

(

)

Gets the average length.

If the attribute is not an string attribute, it just returns 0.

Returns

The average length.

long com.sparsity.sparksee.gdb.AttributeStatistics.GetDistinct

(

)

Gets the number of distinct values (BASIC statistics).

Returns

The number of distinct values.

com.sparsity.sparksee.gdb.Value com.sparsity.sparksee.gdb.AttributeStatistics.GetMax

(

)

Gets the maximum existing value (BASIC statistics).

Returns

The maximum existing value.

int com.sparsity.sparksee.gdb.AttributeStatistics.GetMaxLengthString

(

)

Gets the maximum length.

If the attribute is not an string attribute, it just returns 0.

Returns

The maximum length.

double com.sparsity.sparksee.gdb.AttributeStatistics.GetMean

(

)

Gets the mean or average.

Mean or average: Sum of all Values divided by the number of observations.

It is computed just for numerical attributes.

Returns

The mean.

double com.sparsity.sparksee.gdb.AttributeStatistics.GetMedian

(

)

Gets the median.

Median: Middle value that separates the higher half from the lower.

If a < b < c, then the median of the list {a, b, c} is b, and if a < b < c < d, then the median of the list {a, b, c, d} is the mean of b and c, i.e. it is (b + c)/2

It is computed just for numerical attributes.

Returns

The median.

com.sparsity.sparksee.gdb.Value com.sparsity.sparksee.gdb.AttributeStatistics.GetMin

(

)

Gets the minimum existing value (BASIC statistics).

Returns

The minimum existing value.

int com.sparsity.sparksee.gdb.AttributeStatistics.GetMinLengthString

(

)

Gets the minimum length.

If the attribute is not an string attribute, it just returns 0.

Returns

The minimum length.

com.sparsity.sparksee.gdb.Value com.sparsity.sparksee.gdb.AttributeStatistics.GetMode

(

)

Gets the mode.

Mode: Most frequent Value.

Returns

The mode.

long com.sparsity.sparksee.gdb.AttributeStatistics.GetModeCount

(

)

Gets the number of objects with a Value equal to the mode.

Returns

The number of objects with a Value equal to the mode.

long com.sparsity.sparksee.gdb.AttributeStatistics.GetNull

(

)

Gets the number of objects NULL a Value (BASIC statistics).

Returns

The number of objects NULL a Value.

long com.sparsity.sparksee.gdb.AttributeStatistics.GetTotal

(

)

Gets the number of objects with a non-NULL Value (BASIC statistic).

Returns

The number of objects with a non-NULL Value.

double com.sparsity.sparksee.gdb.AttributeStatistics.GetVariance

(

)

Gets the variance.

It is computed just for numerical attributes.

Returns

The variance.