Features methods for quantifying path values and identifying optimal paths under a variety of modeling assumptions. Intended to be used in service of other structural analyses.
Installation Instructions
library(devtools)
install_github("davidbuch/gretel")# Identify the path of optimal conductivity between nodes 1 and 5 of a sociomatrix
# Using example data from *Yang, Knoke* (2001) <DOI: 10.1016/S0378-8733(01)00043-0>
best_path <- opt_gpv(YangKnoke01, source = 1, target = 5, alpha = 1)
# Compare the conductivity of this path to that of an inferior path
gpv(YangKnoke01, path = best_path, alpha = 1)
gpv(YangKnoke01, path = c(1,2,3,4,5), alpha = 1)
Please see the package vignette for more information and examples.
This package contains two categories of functions. The first category is concerned with assigning values to user specified paths, while the second identifies paths of optimal value.
Key functions in the path value calculation category are
gpv, which calculates Generalized Path Valueppv, which calculates Probabilistic Path Valuebinary_distance, peay_path_value,
flament_path_length, peay_average_path_value,
and flament_average_path_length, which calculate path value
measures described in Yang, Knoke (2001).generate_proximities, which generates a matrix of
values representing the measures of optimal paths from each source node
(row index) to each target node (column index).Key functions in the optimal path identification category are
opt_gpv, which identifies the path of optimal
Generalized Path Value from a particular source node to a particular
target nodeopt_ppv, which identifies the path of optimal
Probabilistic Path Value from a particular source node to a particular
target nodeall_opt_gpv, which identifies the ‘gpv’-optimal paths
from every source node to every target nodeall_opt_ppv, which identifies the ‘ppv’-optimal paths
from every source node to every target nodeunpack, which unpacks the Dijkstra-format encoded
shortest paths returned by all_opt_gpv and
all_opt_ppv. See their help pages for details.David A. Buch
TBA
To my Dad, on his birthday.
GPL-3