|See also:||spccusum2c spccusum2arl|
|Description:||graphical representation of a two-sided CUSUM chart for given data, critical value and reference value k|
|Usage:||spccusum2(k, c, observed)|
|k||scalar, reference value. It must be positive and be expressed as a multiple of the standard error.|
|c||scalar, critical value|
|observed||n x 1 vector of user-defined data|
; A two-sided CUSUM chart for 100 pseudorandom variables ; with normal distribution where the first 80 observations ; have mean = 0, the next 20 have mean = 1. The chart ; parameters are k = 0.5 and in-control ARL = 300: library("spc") mean = #(matrix(80) .* 0, matrix(20) .* 1) randomize(31) observed = normal(100) + mean c = spccusum2c(300,.5,50) spccusum2( .5, c, observed)
Display showing a two-sided CUSUM chart. An alarm is signaled at t = 88.