Fig. 2From: Defining competency in flexible cystoscopy: a novel approach using cumulative Sum analysisCumulative Sum (CUSUM) for assessment of body and dome of bladder (n = 384). Acceptable failure rate at 0.01 and unacceptable failure rate at 0.03. Type I and II error rate 0.1. Each horizontal line on the y-axis represents a control line (h = 1.96)Back to article page