Package io.deephaven.api.agg.spec

Class AggSpecVar

java.lang.Object

io.deephaven.api.agg.spec.AggSpecBase

io.deephaven.api.agg.spec.AggSpecEmptyBase

io.deephaven.api.agg.spec.AggSpecVar

All Implemented Interfaces:

AggSpec

@Immutable
public abstract class AggSpecVar
extends AggSpecEmptyBase

Specifies an aggregation that outputs the sample variance of the input column values for each group. Only works for numeric input types. Sample variance is computed using Bessel's correction (https://en.wikipedia.org/wiki/Bessel%27s_correction), which ensures that the sample variance will be an unbiased estimator of population variance.

See Also:

• TableOperations.varBy()

Nested Class Summary

Nested classes/interfaces inherited from interface io.deephaven.api.agg.spec.AggSpec

AggSpec.Visitor

Constructor Summary

Constructors

Constructor	Description
AggSpecVar()

Method Summary

Modifier and Type	Method	Description
final String	description()	Get a simple description for this AggSpec.
static AggSpecVar	of()
final <V extends AggSpec.Visitor> V	walk(V visitor)	Glue method to deliver this AggSpec to a AggSpec.Visitor.

Methods inherited from class io.deephaven.api.agg.spec.AggSpecBase

aggregation, aggregation, aggregation

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

AggSpecVar

public AggSpecVar()

Method Details

of

public static AggSpecVar of()

description

public final String description()

Description copied from interface: AggSpec

Get a simple description for this AggSpec.

Returns:

The description

walk

public final <V extends AggSpec.Visitor> V walk(V visitor)

Description copied from interface: AggSpec

Glue method to deliver this AggSpec to a AggSpec.Visitor.

Parameters:

visitor - The visitor

Returns:

The visitor