
Evaluating Transmission Reconstruction Accuracy
Source:vignettes/sim-transphylo.Rmd
sim-transphylo.Rmd
library(transNetwork)
library(TransPhylo)Introduction
This vignette demonstrates how to evaluate the accuracy of the
TransPhylo inference engine using the utility functions
in transNetwork. We simulate a “ground truth” outbreak,
perform Bayesian inference, and then compare the results to see how many
infector-infectee pairs were correctly identified.
The Simulation Loop
In this example, we run numsim iterations. For each
iteration, we simulate a small outbreak of 10 individuals.
set.seed(42)
numsim <- 10
accuracy_scores <- numeric(numsim)
for (i in 1:numsim) {
# 1. Simulate an outbreak with R0 = 1.0 (infection_rate / removal_rate)
outbreak <- simulate_outbreak(infection_rate = 3.0, removal_rate = 3.0, target_size = 10)
numcase <- nrow(outbreak)
# 2. Build the phylogenetic time tree (the input for TransPhylo)
timetree <- build_timetree(outbreak, plot = FALSE)
# 3. TransPhylo inference
ptree <- TransPhylo::ptreeFromPhylo(timetree, dateLastSample = 2007.964)
res <- TransPhylo::inferTTree(ptree, mcmcIterations = 10000, w.shape = 10, w.scale = 0.1, dateT = 2008)
# 4. Process Who-Infected-Whom (WIW) matrix
matrixwiw <- TransPhylo::computeMatWIW(res, burnin = 0.5)
# Use transNetwork utility to convert matrix to edge list
netedges <- transmission_edges_matrixwiw(matrixwiw)
# 5. Calculate Accuracy
# Compare the inferred infector (Column 2 of netedges) with the truth (Column 2 of outbreak)
correct_matches <- length(which(as.numeric(netedges[, 2]) - outbreak[, 2] == 0))
accuracy_scores[i] <- correct_matches / (numcase-1)
}
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|======================================================================| 100%Results and Analysis
Once the simulations are complete, we can calculate the mean accuracy. This metric represents the probability that the model correctly identifies the true source of infection for a given case.
Visualizing the Reconstructed Network
Finally, we can use transplot to visualize the network
from the final simulation. In this plot, the source is highlighted in
grey, and edge colors indicate the posterior probability of the
transmission link.
# Plotting the last simulated network
transplot(netedges, style = 1)