u chart: nonconformities per unit of exposure

Usage

edetect_u(x, n, center = NULL, phase1 = NULL, ...)

Arguments

x: Counts per sample.
n: Exposure (area of opportunity) of each sample.
center: Pre-change rate per unit exposure; omit to estimate it from phase1.
phase1: Optional Phase I data frame with columns x and n.
...: Passed to edetect_design() (arl, direction, type, evalue, delta, weights).

Value

An edetect_chart.

Examples

chart <- edetect_u(x = c(3, 2, 4, 3, 8, 9, 11), n = c(2, 2, 2, 2, 2, 2, 2), center = 1.5, arl = 100)
#> Warning: Alarm at t = 6; 1 later observation was not consumed.
edetect_alarm(chart)
#> # A tibble: 1 × 6
#>   alarm alarm_time evidence threshold change_estimate n_observed
#>   <lgl>      <int>    <dbl>     <dbl>           <int>      <int>
#> 1 TRUE           6     499.       100               5          6