The following properties of Q-Q plots and probability plots make them useful diagnostics of how well a specified theoretical distribution fits a set of measurements: Q-Q plots are more convenient than ...

Figure 10.6 illustrates how a Q-Q plot is constructed. First, the n nonmissing values of the variable are ordered from smallest to largest: ...

In order to calculate this value we must first understand what the lower quartile, median and upper quartile are: the lower quartile is the median of the lower half of the data. The \(\frac{(n+1)}{ ...