epi.popsize {epiR} | R Documentation |
Estimates population size on the basis of capture-recapture sampling.
epi.popsize(T1, T2, T12, conf.level = 0.95, verbose = FALSE)
T1 |
an integer representing the number of individuals tested in the first round. |
T2 |
an integer representing the number of individuals tested in the second round. |
T12 |
an integer representing the number of individuals tested in both the first and second round. |
conf.level |
magnitude of the returned confidence interval. Must be a single number between 0 and 1. |
verbose |
logical indicating whether detailed or summary results are to be returned. |
Returns the estimated population size and an estimate of the numbers of individuals that remain untested.
Cannon RM, Roe RT (1982). Livestock Disease Surveys A Field Manual for Veterinarians. Australian Government Publishing Service, Canberra, pp. 34.
## EXAMPLE 1: ## In a field survey 400 feral pigs are captured, marked and then released. ## On a second occassion 40 of the orignal capture are found when another 400 ## pigs are captured. Estimate the size of this feral pig population. Estimate ## the number of feral pigs that have not been tested. epi.popsize(T1 = 400, T2 = 400, T12 = 40, conf.level = 0.95, verbose = FALSE) ## Estimated population size: 4000 (95% CI 3125 to 5557) ## Estimated number of untested pigs: 3240 (95% CI 2365 to 4797)