STSAttributeStatistics Class Reference

Attribute statistics class. More...

#include <Sparksee.h>

Inheritance diagram for STSAttributeStatistics:

Collaboration diagram for STSAttributeStatistics:

Instance Methods
(long long)	- getTotal
	Gets the number of objects with a non-NULL Value (BASIC statistic).
(long long)	- getNull
	Gets the number of objects NULL a Value (BASIC statistics).
(long long)	- getDistinct
	Gets the number of distinct values (BASIC statistics).
(STSValue *)	- getMin
	Gets the minimum existing value (BASIC statistics).
(STSValue *)	- getMax
	Gets the maximum existing value (BASIC statistics).
(int)	- getMaxLengthString
	Gets the maximum length.
(int)	- getMinLengthString
	Gets the minimum length.
(double)	- getAvgLengthString
	Gets the average length.
(STSValue *)	- getMode
	Gets the mode.
(long long)	- getModeCount
	Gets the number of objects with a Value equal to the mode.
(double)	- getMean
	Gets the mean or average.
(double)	- getVariance
	Gets the variance.
(double)	- getMedian
	Gets the median.

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

Method Documentation

getAvgLengthString

- (double) getAvgLengthString

Gets the average length.

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

Returns

The average length.

References getAvgLengthString.

Referenced by getAvgLengthString.

getDistinct

- (long long) getDistinct

Gets the number of distinct values (BASIC statistics).

Returns

The number of distinct values.

References getDistinct.

Referenced by getDistinct.

getMax

- (STSValue *) getMax

Gets the maximum existing value (BASIC statistics).

Returns

The maximum existing value.

References getMax.

Referenced by getMax.

getMaxLengthString

- (int) getMaxLengthString

Gets the maximum length.

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

Returns

The maximum length.

References getMaxLengthString.

Referenced by getMaxLengthString.

getMean

- (double) 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.

References getMean.

Referenced by getMean.

getMedian

- (double) 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.

References getMedian.

Referenced by getMedian.

getMin

- (STSValue *) getMin

Gets the minimum existing value (BASIC statistics).

Returns

The minimum existing value.

References getMin.

Referenced by getMin.

getMinLengthString

- (int) getMinLengthString

Gets the minimum length.

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

Returns

The minimum length.

References getMinLengthString.

Referenced by getMinLengthString.

getMode

- (STSValue *) getMode

Gets the mode.

Mode: Most frequent Value.

Returns

The mode.

References getMode.

Referenced by getMode.

getModeCount

- (long long) 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.

References getModeCount.

Referenced by getModeCount.

getNull

- (long long) getNull

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

Returns

The number of objects NULL a Value.

References getNull.

Referenced by getNull.

getTotal

- (long long) getTotal

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

Returns

The number of objects with a non-NULL Value.

References getTotal.

Referenced by getTotal.

getVariance

- (double) getVariance

Gets the variance.

It is computed just for numerical attributes.

Returns

The variance.

References getVariance.

Referenced by getVariance.

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

• Sparksee.h