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P–P plot
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<p>In statistics, a P–P plot (probability–probability plot or percent–percent plot or P value plot) is a probability plot for assessing how closely two <a href="/facts/Data_set/eDvegUTK">data sets</a> agree, or for assessing how closely a dataset fits a particular model. It works by plotting the two <a href="/facts/Cumulative_distribution_function/WaKU8tp4">cumulative distribution functions</a> against each other; if they are similar, the data will appear to be nearly a straight line. This behavior is similar to that of the more widely used <a href="/facts/Q%25E2%2580%2593Q_plot/h2jKBjYm">Q–Q plot</a>, with which it is often confused. </p>