Plotting P-P Plots

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Yes

Nominal attributes not supported

General parameters

Compared distribution

The family of distribution with which comparisons are performed can be selected from the following values: normal, beta or exponential.

The corresponding options must then be specified below.

Normal distribution parameters

Mean

Normal distribution is a continuous probability distribution where values are symmetrically distributed around the average value, defined here as the Mean µ. The Standard Deviation σ defines how far the displayed values can deviate from the mean.

Normal distribution is defined as follows:

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where:

• µ is the mean or expectation of the distribution, and

• σ is the standard deviation.

Standard deviation

Beta distribution parameters

Alpha

Beta distribution displays a probabilistic display of probabilities, by defining Alpha (α) and Beta (β) values, which will be used to define the distribution as follows: 

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where

Beta

Exponential distribution parameters

Lambda

Exponential distribution calculates the time which occurs between two events, where the Lambda (λ) value specified here is the average number of events in 1 unit of time.

The exponential distribution is given by:

Dragging and dropping the age attribute onto an x cell and selecting P-P Plot in the Plot cell will display the P-P plot of the age attribute compared with the Normal distribution (default comparison).