Package nz.org.riskscape.defaults.function

Class AALHazardBasedFunction

java.lang.Object

nz.org.riskscape.defaults.function.AALHazardBasedFunction

All Implemented Interfaces:

nz.org.riskscape.engine.rl.agg.AggregationFunction

public class AALHazardBasedFunction
extends Object
implements nz.org.riskscape.engine.rl.agg.AggregationFunction

Calculates an AAL for a hazard-based probabilistic data. We have a series of x,y datapoints, representing the loss and EP (Exceedance Probability). The AAL is the area under the x,y "curve". NB: we just connect the data-points via a straight-line (i.e. piecewise linear data), which simplifies the AAL calculation.

For the AAL calculation we use x=EP, y=loss. This seems to produce better results, because the spacing between X datapoints is consistent. Whereas if we used x=loss, y=EP, if we get duplicate losses then we end up with a zero AAL for the duplicates (i.e. there's no area under the curve). Refer GL993 for more details.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	AALHazardBasedFunction.LocalProblems

Field Summary

Fields

Modifier and Type	Field	Description
static final int	MIN_NUM_EVENTS
static final com.google.common.collect.Range<Double>	PROBABILITY_RANGE
static final AALHazardBasedFunction.LocalProblems	PROBLEMS

Constructor Summary

Constructors

Constructor	Description
AALHazardBasedFunction()

Method Summary

Modifier and Type	Method	Description
nz.org.riskscape.engine.function.ArgumentList	getArguments()
nz.org.riskscape.engine.types.Type	getReturnType()
nz.org.riskscape.problem.ResultOrProblems<nz.org.riskscape.engine.rl.agg.RealizedAggregateExpression>	realize(nz.org.riskscape.engine.rl.RealizationContext context, nz.org.riskscape.engine.types.Type inputType, nz.org.riskscape.rl.ast.FunctionCall fc)

Methods inherited from class java.lang.Object

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

Field Details

PROBABILITY_RANGE

public static final com.google.common.collect.Range<Double> PROBABILITY_RANGE

MIN_NUM_EVENTS

public static final int MIN_NUM_EVENTS

See Also:

• Constant Field Values

PROBLEMS

public static final AALHazardBasedFunction.LocalProblems PROBLEMS

Constructor Details

AALHazardBasedFunction

public AALHazardBasedFunction()

Method Details

realize

public nz.org.riskscape.problem.ResultOrProblems<nz.org.riskscape.engine.rl.agg.RealizedAggregateExpression> realize(nz.org.riskscape.engine.rl.RealizationContext context,
 nz.org.riskscape.engine.types.Type inputType,
 nz.org.riskscape.rl.ast.FunctionCall fc)

Specified by:

realize in interface nz.org.riskscape.engine.rl.agg.AggregationFunction

getArguments

public nz.org.riskscape.engine.function.ArgumentList getArguments()

Specified by:

getArguments in interface nz.org.riskscape.engine.rl.agg.AggregationFunction

getReturnType

public nz.org.riskscape.engine.types.Type getReturnType()

Specified by:

getReturnType in interface nz.org.riskscape.engine.rl.agg.AggregationFunction