Birnbaum (jreliability v2.0 API)

java.lang.Object
- org.jreliability.importancemeasures.Birnbaum<T>

Type Parameters:

T - The type of the variables of the BDD of the system

All Implemented Interfaces:

ImportanceMeasure, TimeDependentImportanceMeasure<T>
```
public class Birnbaum<T>
extends java.lang.Object
implements TimeDependentImportanceMeasure<T>
```
The Birnbaum class calculates the Birnbaum Importance for coherent systems. This is done via boolean expression in the CriticalityCalculator using [ABGT17]. As a result, it is equivalent to the importance measure proposed by Zaitseva and Levashenko in [ZL13]. [ABGT17] ( https://doi.org/10.1016/j.ress.2016.12.013 ) [ZL13] ( https://doi.org/10.1134/S000511791302001X )

Field Summary

Fields
Modifier and Type Field Description

protected CriticalityCalculator<T> critCalc

Constructor Summary

Constructors
Constructor	Description
`Birnbaum(BDD<T> bdd, org.apache.commons.collections15.Transformer<T,ReliabilityFunction> transformer)`	Returns a `Birnbaum` calculator for a specific system with its `BDD` and `ReliabilityFunction` `Transformer`.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`java.util.Map<T,java.lang.Double>`	`calculate(double time)`	Calculates the Birnbaum importances for all components at the specified time.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - critCalc
```
protected final CriticalityCalculator<T> critCalc
```
- Constructor Detail
  - Birnbaum
```
public Birnbaum(BDD<T> bdd,
                org.apache.commons.collections15.Transformer<T,ReliabilityFunction> transformer)
```
    Returns a Birnbaum calculator for a specific system with its BDD and ReliabilityFunction Transformer.
    
    Parameters:
    
    bdd - The BDD representing the system structure function
    
    transformer - The Transformer used to get the ReliabilityFunction of variables present in the BDD
- Method Detail
  - calculate
```
public java.util.Map<T,java.lang.Double> calculate(double time)
```
    Calculates the Birnbaum importances for all components at the specified time. Uses equation 6 of [ABGT17] to calculate the importance from the failure criticality of the component.
    
    Specified by:
    
    calculate in interface TimeDependentImportanceMeasure<T>
    
    Parameters:
    
    time - Time t at which the Birnbaum importance of all components is calculated. Must be greater than 0, otherwise an IllegalArgumentException is thrown.
    
    Returns:
    
    results Map of components and their respective Birnbaum importance at time t.