## Class BoundsOnRatiosInTupleSketchedSets

• java.lang.Object

• ```public final class BoundsOnRatiosInTupleSketchedSets
extends Object```
This class is used to compute the bounds on the estimate of the ratio B / A, where:
• A is a Tuple Sketch of population PopA.
• B is a Tuple or Theta Sketch of population PopB that is a subset of A, obtained by an intersection of A with some other Tuple or Theta Sketch C, which acts like a predicate or selection clause.
• The estimate of the ratio PopB/PopA is BoundsOnRatiosInThetaSketchedSets.getEstimateOfBoverA(A, B).
• The Upper Bound estimate on the ratio PopB/PopA is BoundsOnRatiosInThetaSketchedSets.getUpperBoundForBoverA(A, B).
• The Lower Bound estimate on the ratio PopB/PopA is BoundsOnRatiosInThetaSketchedSets.getLowerBoundForBoverA(A, B).
Note: The theta of A cannot be greater than the theta of B. If B is formed as an intersection of A and some other set C, then the theta of B is guaranteed to be less than or equal to the theta of B.
Author:
Kevin Lang, Lee Rhodes, David Cromberge
• ### Method Summary

All Methods
Modifier and Type Method Description
`static <S extends Summary>double` ```getEstimateOfBoverA​(Sketch<S> sketchA, Sketch sketchB)```
Gets the estimate for B over A
`static <S extends Summary>double` ```getEstimateOfBoverA​(Sketch<S> sketchA, Sketch<S> sketchB)```
Gets the estimate for B over A
`static <S extends Summary>double` ```getLowerBoundForBoverA​(Sketch<S> sketchA, Sketch sketchB)```
Gets the approximate lower bound for B over A based on a 95% confidence interval
`static <S extends Summary>double` ```getLowerBoundForBoverA​(Sketch<S> sketchA, Sketch<S> sketchB)```
Gets the approximate lower bound for B over A based on a 95% confidence interval
`static <S extends Summary>double` ```getUpperBoundForBoverA​(Sketch<S> sketchA, Sketch sketchB)```
Gets the approximate upper bound for B over A based on a 95% confidence interval
`static <S extends Summary>double` ```getUpperBoundForBoverA​(Sketch<S> sketchA, Sketch<S> sketchB)```
Gets the approximate upper bound for B over A based on a 95% confidence interval
• ### Methods inherited from class java.lang.Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`
• ### Method Detail

• #### getLowerBoundForBoverA

```public static <S extends Summary> double getLowerBoundForBoverA​(Sketch<S> sketchA,
Sketch<S> sketchB)```
Gets the approximate lower bound for B over A based on a 95% confidence interval
Type Parameters:
`S` - Summary
Parameters:
`sketchA` - the Tuple sketch A with summary type S
`sketchB` - the Tuple sketch B with summary type S
Returns:
the approximate lower bound for B over A
• #### getLowerBoundForBoverA

```public static <S extends Summary> double getLowerBoundForBoverA​(Sketch<S> sketchA,
Sketch sketchB)```
Gets the approximate lower bound for B over A based on a 95% confidence interval
Type Parameters:
`S` - Summary
Parameters:
`sketchA` - the Tuple sketch A with summary type S
`sketchB` - the Theta sketch B
Returns:
the approximate lower bound for B over A
• #### getUpperBoundForBoverA

```public static <S extends Summary> double getUpperBoundForBoverA​(Sketch<S> sketchA,
Sketch<S> sketchB)```
Gets the approximate upper bound for B over A based on a 95% confidence interval
Type Parameters:
`S` - Summary
Parameters:
`sketchA` - the Tuple sketch A with summary type S
`sketchB` - the Tuple sketch B with summary type S
Returns:
the approximate upper bound for B over A
• #### getUpperBoundForBoverA

```public static <S extends Summary> double getUpperBoundForBoverA​(Sketch<S> sketchA,
Sketch sketchB)```
Gets the approximate upper bound for B over A based on a 95% confidence interval
Type Parameters:
`S` - Summary
Parameters:
`sketchA` - the Tuple sketch A with summary type S
`sketchB` - the Theta sketch B
Returns:
the approximate upper bound for B over A
• #### getEstimateOfBoverA

```public static <S extends Summary> double getEstimateOfBoverA​(Sketch<S> sketchA,
Sketch<S> sketchB)```
Gets the estimate for B over A
Type Parameters:
`S` - Summary
Parameters:
`sketchA` - the Tuple sketch A with summary type S
`sketchB` - the Tuple sketch B with summary type S
Returns:
the estimate for B over A
• #### getEstimateOfBoverA

```public static <S extends Summary> double getEstimateOfBoverA​(Sketch<S> sketchA,
Sketch sketchB)```
Gets the estimate for B over A
Type Parameters:
`S` - Summary
Parameters:
`sketchA` - the Tuple sketch A with summary type S
`sketchB` - the Theta sketch B
Returns:
the estimate for B over A