obs_pairs_stsl {phylosamp}

Expected number of observed pairs assuming single-transmission and single-linkage

Description

This function calculates the expected number of link pairs observed in a sample of size M. The single-transmission and single-linkage method assumes the following:

1. Each case i is linked by transmission to only one other case j in the population (N).

2. Each case i is linked by the linkage criteria to only one other case j in the sampled population (M).

Usage

obs_pairs_stsl(eta, chi, rho, M)

Arguments

eta

scalar or vector giving the sensitivity of the linkage criteria

chi

scalar or vector giving the specificity of the linkage criteria

rho

scalar or vector giving the proportion of the final outbreak size that is sampled

M

scalar or vector giving the number of cases sampled

Value

scalar or vector giving the expected number of linked pairs observed in the sample

Author(s)

John Giles, Shirlee Wohl, and Justin Lessler

See Also

Other obs_pairs: exp_links(), obs_pairs_mtml(), obs_pairs_mtsl()

Examples

# perfect sensitivity and specificity
obs_pairs_stsl(eta=1, chi=1, rho=0.5, M=100)

obs_pairs_stsl(eta=0.99, chi=0.9, rho=1, M=50)

obs_pairs_stsl(eta=0.99, chi=0.9, rho=0.5, M=100)