PathProb: Probability of path choices

In MartinLHazelton/transportation: What the Package Does (One Line, Title Case)

Probability of path choices

Description

This function calculates probabilities for selection of each path on the network based on set of path disutilities (costs). The function uses either a logit or probit random utility model.

Usage

PathProb(u, ODpair, A, RUM = "logit", theta = 1)

Arguments

u	Vector of utlities on each path
ODpair	Vector indicating the OD pair serviced by each route (ordered by columns of the path-link incidence matrix, A).
A	Path-link incidence matrix
RUM	Choice of random utility model. Can be "logit" (the default) or "probit".
theta	A dispersion parameter. For the logit model, a single value specifying the logit parameter. For the probit model, a vector of standard deviations for the individual link cost errors. Defaults to 1.

Value

Vector of route choice probabilities

Examples

A <- matrix(c(0,1,0,0,1,0,0,0,0,1,1,0,0,0,1,0,0,0,0,1,1,0,0,0,0,0,0,1),ncol=4,byrow=T)
ODpair <- c(1,1,2,2)
Alpha <- rep(10,7)
Beta <- rep(2,7)
pow <- rep(4,7)
path_flow <- c(10,20,15,15)
x <- A%*%path_flow
u <- PathCost(x,A,Alpha,Beta)
PathProb(u,ODpair,A,RUM="logit",theta=0.7)

MartinLHazelton/transportation documentation built on Aug. 5, 2023, 10:28 a.m.