Class AttributeStatistics

java.lang.Object
com.sparsity.sparksee.gdb.AttributeStatistics
public class AttributeStatistics extends Object
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 Details

    • getMinLengthString

      public int getMinLengthString()
      Gets the minimum length.

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

      Returns:
      The minimum length.

    • getModeCount

      public 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.

    • getVariance

      public double getVariance()
      Gets the variance.

      It is computed just for numerical attributes.

      Returns:
      The variance.

    • getMode

      public Value getMode()
      Gets the mode.

      Mode: Most frequent Value.

      Returns:
      The mode.

    • getMin

      public Value getMin()
      Gets the minimum existing value (BASIC statistics).

      Returns:
      The minimum existing value.

    • getMedian

      public 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.

    • getTotal

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

      Returns:
      The number of objects with a non-NULL Value.

    • getMaxLengthString

      public int getMaxLengthString()
      Gets the maximum length.

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

      Returns:
      The maximum length.

    • getMean

      public 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.

    • getNull

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

      Returns:
      The number of objects NULL a Value.

    • getDistinct

      public long getDistinct()
      Gets the number of distinct values (BASIC statistics).

      Returns:
      The number of distinct values.

    • getAvgLengthString

      public double getAvgLengthString()
      Gets the average length.

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

      Returns:
      The average length.

    • getMax

      public Value getMax()
      Gets the maximum existing value (BASIC statistics).

      Returns:
      The maximum existing value.