Probability Plot - short version

Graph that shows frequency of sample data compared to a specific mathematical distribution (e.g., normal distribution).

Probability Plot - long version

Probability plot is a graphical technique for comparing two data sets, either two sets of empirical observations, one empirical set against a theoretical set, or (more rarely) two theoretical sets against each other. It commonly means one of:

* P-P plot, "Probability-Probability" or "Percent-Percent" plot;

* Q-Q plot, "Quantile-Quantile" plot, which is more commonly used. Special cases include the Normal probability plot, a Q-Q plot against the standard normal distribution;

The term "probability plot" may be used to refer to both of these types of plot, or the term "probability plot" may be used to refer specifically to a P-P plot.

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