Calculates the reference value k
for a Poisson or binomial CUSUM
designed to detect a shift from \(\theta_0\) to \(\theta_1\)
findK(theta0, theta1, distr = c("poisson", "binomial"),
roundK = FALSE, digits = 1, ...)
Returns reference value k
.
in-control parameter
out-of-control parameter
"poisson"
or "binomial"
the reference value k
is rounded to digits
decimal places
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.