org.opentripplanner.profile

Enum PropagatedTimesStore.ConfidenceCalculationMethod

java.lang.Object

java.lang.Enum<PropagatedTimesStore.ConfidenceCalculationMethod>

org.opentripplanner.profile.PropagatedTimesStore.ConfidenceCalculationMethod

All Implemented Interfaces:

Serializable, Comparable<PropagatedTimesStore.ConfidenceCalculationMethod>

Enclosing class:

PropagatedTimesStore

public static enum PropagatedTimesStore.ConfidenceCalculationMethod
extends Enum<PropagatedTimesStore.ConfidenceCalculationMethod>

Enum Constant Summary

Enum Constants

Enum Constant and Description
BOOTSTRAP Calculate confidence intervals around the mean using the bootstrap.
MIN_MAX Take the min and the max of the experienced of the experienced times.
NONE Do not calculate confidence intervals
PERCENTILE Calculate confidence intervals based on percentiles, which is what you want to do when you have a scheduled network.

Method Summary

Modifier and Type	Method and Description
static PropagatedTimesStore.ConfidenceCalculationMethod	valueOf(String name) Returns the enum constant of this type with the specified name.
static PropagatedTimesStore.ConfidenceCalculationMethod[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

NONE

public static final PropagatedTimesStore.ConfidenceCalculationMethod NONE

Do not calculate confidence intervals

BOOTSTRAP

public static final PropagatedTimesStore.ConfidenceCalculationMethod BOOTSTRAP

Calculate confidence intervals around the mean using the bootstrap. Note that this calculates the confidence that the mean is in fact the mean of all possible schedules, not the confidence that a particular but unknown schedule will behave a certain way. This is absolutely the correct approach in systems that are specified as frequencies both in the model and operationally, because the parameter of interest is the average accessibility afforded by every realization of transfer and wait time. This yields nice tiny confidence intervals around the mean, and allows us easily to measure changes in average accessibility. However, when you have a system that will eventually be scheduled, you are interested not in the distribution of the average accessibility over all possible schedules, but rather the distribution of the accessibility afforded by a particular but unknown schedule. This does not require bootstrapping; it's just taking percentiles on the output of the Monte Carlo simulation. Unfortunately this requires a lot more Monte Carlo samples, as of course the middle of the distribution will stabilize long before the extrema.

PERCENTILE

public static final PropagatedTimesStore.ConfidenceCalculationMethod PERCENTILE

Calculate confidence intervals based on percentiles, which is what you want to do when you have a scheduled network.

MIN_MAX

public static final PropagatedTimesStore.ConfidenceCalculationMethod MIN_MAX

Take the min and the max of the experienced of the experienced times. Monte Carlo simulations also include one run with worst-case and one run with best-case boarding, so this is valid even for frequency service.

Method Detail

values

public static PropagatedTimesStore.ConfidenceCalculationMethod[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (PropagatedTimesStore.ConfidenceCalculationMethod c : PropagatedTimesStore.ConfidenceCalculationMethod.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static PropagatedTimesStore.ConfidenceCalculationMethod valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null