Computes the tansmission assortativity coefficient defined as the excess probability of a secondary infection taking place within-group compared to random expectations.
Usage
get_gamma(from, to, f, alpha = 0.05)
Arguments
- from
A vector of infectors.
- to
A vector of infectees.
- f
A named numeric value representing the prevalence of each group in the population or directly the group sizes.
- alpha
The significance level for the confidence interval.
Value
A data frame with the estimated gamma, lower and upper confidence limits for each group.
Examples
from <- c("A", "A", NA, "C", "C", "C")
to <- c("A", "B", "B", "C", "C", "C")
f <- c(A = 0.3, B = 0.2, C = 0.5)
get_gamma(from, to, f, alpha = 0.05)
#> group est lwr upr
#> 1 A 2.333333 0.02972519 183.1593
#> 2 B NaN NaN NaN
#> 3 C Inf 0.41323136 Inf