A cumulative distribution graph is produced by plotting the ordered data versus the cumulative distribution values (graph on the top left in the figure below). How the Normal QQ plot is constructedįirst, the data values are ordered and cumulative distribution values are calculated as ( i– 0.5) /n for the ith ordered value out of n total values (this gives the proportion of the data that falls below a certain value). Quantile-quantile (QQ) plots are graphs on which quantiles from two distributions are plotted relative to each other. An example of using data transformations.
Examining data distributions using QQ plots.
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