findK {surveillance}R Documentation

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.


[Package surveillance version 1.0-3 Index]