## org.jfree.data.statistics
Interface StatisticalCategoryDataset

All Superinterfaces:
  CategoryDataset, Dataset, KeyedValues2D, Values2D

All Known Implementing Classes:
  DefaultStatisticalCategoryDataset

    public interface StatisticalCategoryDataset

extends CategoryDataset

A category dataset that defines a mean and standard deviation value for each item.

Method Summary
`java.lang.Number` `getMeanValue(java.lang.Comparable rowKey, java.lang.Comparable columnKey)` Returns the mean value for an item.
`java.lang.Number` `getMeanValue(int row, int column)` Returns the mean value for an item.
`java.lang.Number` `getStdDevValue(java.lang.Comparable rowKey, java.lang.Comparable columnKey)` Returns the standard deviation value for an item.
`java.lang.Number` `getStdDevValue(int row, int column)` Returns the standard deviation value for an item.

Methods inherited from interface org.jfree.data.KeyedValues2D
`getColumnIndex, getColumnKey, getColumnKeys, getRowIndex, getRowKey, getRowKeys, getValue`

Methods inherited from interface org.jfree.data.Values2D
`getColumnCount, getRowCount, getValue`

Methods inherited from interface org.jfree.data.general.Dataset
`addChangeListener, getGroup, removeChangeListener, setGroup`

Method Detail

### getMeanValue

    java.lang.Number getMeanValue(int row,
                                  int column)

  Returns the mean value for an item.

  Parameters:
    `row` - the row index (zero-based).
    `column` - the column index (zero-based).
  Returns:
    The mean value (possibly `null`).

### getMeanValue

    java.lang.Number getMeanValue(java.lang.Comparable rowKey,
                                  java.lang.Comparable columnKey)

  Returns the mean value for an item.

  Parameters:
    `rowKey` - the row key.
    `columnKey` - the columnKey.
  Returns:
    The mean value (possibly `null`).

### getStdDevValue

    java.lang.Number getStdDevValue(int row,
                                    int column)

  Returns the standard deviation value for an item.

  Parameters:
    `row` - the row index (zero-based).
    `column` - the column index (zero-based).
  Returns:
    The standard deviation (possibly `null`).

### getStdDevValue

    java.lang.Number getStdDevValue(java.lang.Comparable rowKey,
                                    java.lang.Comparable columnKey)

  Returns the standard deviation value for an item.

  Parameters:
    `rowKey` - the row key.
    `columnKey` - the columnKey.
  Returns:
    The standard deviation (possibly `null`).