Signal rates during linear drift in process mean.

<p>Each panel shows the proportion of simulated run charts (N = 1000) that signaled the runs test in run charts of different lengths from 2 to 100. Each line shows the signal rate when using random samples from a normal distribution with a standard deviation of 1 while introducing a drift in sample mean of 0, 0.1, 0.2, and 0.3 respectively between sample data points.