Figure 2
From: Screening for data clustering in multicenter studies: the residual intraclass correlation
Random physician intercept plots. From left to right and from top to bottom: amount of free fluid in the pouch of Douglas (mm), current use of hormonal therapy (yes/no), pelvic pain during examination (yes/no), color score of intratumoral blood flow (ordinal, 1 no blood flow, 2 minimal blood flow, 3 moderate blood flow, 4 very strong blood flow). X-axis: average measure or prevalence per physician. Bubble size represents the number of patients per physician. Dark bubbles: physicians with a random intercept different from zero (adjusted p-value < 0.05 after correction for multiple testing using the false discovery rate method).