AttributeStatistics Class Reference

Attribute statistics class. More...

Public Member Functions
	~AttributeStatistics ()
	Destructor.
int64_t	GetTotal () const
	Gets the number of objects with a non-NULL Value (BASIC statistic). More...
int64_t	GetNull () const
	Gets the number of objects NULL a Value (BASIC statistics). More...
int64_t	GetDistinct () const
	Gets the number of distinct values (BASIC statistics). More...
const Value &	GetMin () const
	Gets the minimum existing value (BASIC statistics). More...
const Value &	GetMax () const
	Gets the maximum existing value (BASIC statistics). More...
int32_t	GetMaxLengthString () const
	Gets the maximum length. More...
int32_t	GetMinLengthString () const
	Gets the minimum length. More...
double64_t	GetAvgLengthString () const
	Gets the average length. More...
const Value &	GetMode () const
	Gets the mode. More...
int64_t	GetModeCount () const
	Gets the number of objects with a Value equal to the mode. More...
double64_t	GetMean () const
	Gets the mean or average. More...
double64_t	GetVariance () const
	Gets the variance. More...
double64_t	GetMedian () const
	Gets the median. More...

Friends
class	Graph

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

double64_t AttributeStatistics::GetAvgLengthString ( ) const

inline

Gets the average length.

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

Returns

The average length.

int64_t AttributeStatistics::GetDistinct ( ) const

inline

Gets the number of distinct values (BASIC statistics).

Returns

The number of distinct values.

const Value& AttributeStatistics::GetMax ( ) const

inline

Gets the maximum existing value (BASIC statistics).

Returns

The maximum existing value.

int32_t AttributeStatistics::GetMaxLengthString ( ) const

inline

Gets the maximum length.

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

Returns

The maximum length.

double64_t AttributeStatistics::GetMean ( ) const

inline

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.

double64_t AttributeStatistics::GetMedian ( ) const

inline

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.

const Value& AttributeStatistics::GetMin ( ) const

inline

Gets the minimum existing value (BASIC statistics).

Returns

The minimum existing value.

int32_t AttributeStatistics::GetMinLengthString ( ) const

inline

Gets the minimum length.

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

Returns

The minimum length.

const Value& AttributeStatistics::GetMode ( ) const

inline

Gets the mode.

Mode: Most frequent Value.

Returns

The mode.

int64_t AttributeStatistics::GetModeCount ( ) const

inline

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

Returns

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

int64_t AttributeStatistics::GetNull ( ) const

inline

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

Returns

The number of objects NULL a Value.

int64_t AttributeStatistics::GetTotal ( ) const

inline

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

Returns

The number of objects with a non-NULL Value.

double64_t AttributeStatistics::GetVariance ( ) const

inline

Gets the variance.

It is computed just for numerical attributes.

Returns

The variance.

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The documentation for this class was generated from the following file:

• Graph_data.h