Package uk.ac.starlink.ttools.filter
Class TableStats
java.lang.Object
uk.ac.starlink.ttools.filter.TableStats
Aggregates column statistics for a table.
Factory methods are provided to accumulate statistics from table data.
- Since:
- 3 Dec 2020
- Author:
- Mark Taylor
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Field Summary
FieldsModifier and TypeFieldDescriptionstatic final double
Value by which Median Absolute Deviation is scaled to estimate SD. -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionstatic double[]
calculateMads
(uk.ac.starlink.table.StarTable table, uk.ac.starlink.table.RowRunner runner, Supplier<Quantiler> qSupplier, double[] medians) Calculates Median Absolute Deviations for each table column.static TableStats
calculateStats
(uk.ac.starlink.table.StarTable table, uk.ac.starlink.table.RowRunner runner, Supplier<Quantiler> qSupplier, boolean doCard) Calculates statistics from a given table.Returns the array of per-column statistics accumulators.long
Returns the number of rows for which statistics have been accumulated.
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Field Details
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MAD_SCALE
public static final double MAD_SCALEValue by which Median Absolute Deviation is scaled to estimate SD.- See Also:
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Constructor Details
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TableStats
Constructor.- Parameters:
colStats
- array of per-column statistics accumulators
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Method Details
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getColumnStats
Returns the array of per-column statistics accumulators.- Returns:
- column stats
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getRowCount
public long getRowCount()Returns the number of rows for which statistics have been accumulated.- Returns:
- row count
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calculateStats
public static TableStats calculateStats(uk.ac.starlink.table.StarTable table, uk.ac.starlink.table.RowRunner runner, Supplier<Quantiler> qSupplier, boolean doCard) throws IOException Calculates statistics from a given table.- Parameters:
table
- table supplying datarunner
- controls sequential/parallel processingqSupplier
- supplies quantile accumulators if quantiles are required, otherwise nulldoCard
- whether to count distinct values- Throws:
IOException
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calculateMads
public static double[] calculateMads(uk.ac.starlink.table.StarTable table, uk.ac.starlink.table.RowRunner runner, Supplier<Quantiler> qSupplier, double[] medians) throws IOException Calculates Median Absolute Deviations for each table column.- Parameters:
table
- input tablerunner
- controls sequential/parallel processingqSupplier
- supplies quantile accumulatorsmedians
- per-column array of median values; MADs will be calculated only for elements with non-null values- Returns:
- per-column array of MADs
- Throws:
IOException
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