findK: Find Reference Value

In surveillance: Temporal and Spatio-Temporal Modeling and Monitoring of Epidemic Phenomena

Find Reference Value

Description

Calculates the reference value k for a Poisson or binomial CUSUM designed to detect a shift from \theta_0 to \theta_1

Usage

findK(theta0, theta1, distr = c("poisson", "binomial"),
      roundK = FALSE, digits = 1, ...)

Arguments

theta0	in-control parameter
theta1	out-of-control parameter
distr	"poisson" or "binomial"
digits	the reference value k is rounded to digits decimal places
roundK	For discrete data and rational reference value there is only a limited set of possible values that the CUSUM can take (and therefore there is also only a limited set of ARLs). If roundK=TRUE, integer multiples of 0.5 are avoided when rounding the reference value k, i.e. the CUSUM can take more values.
...	further arguments for the distribution function, i.e. number of trials n for the binomial CDF.

Value

Returns reference value k.

surveillance documentation built on Nov. 4, 2024, 3 a.m.