Cumulative distribution function widget

[brylie]

User story

As a data analyst
I would like to view the cumulative distribution function for observations in my data set
so that I can intuitively grasp the probability that an observation will fall above or below a given threshold

Feature

A cumulative distribution function widget would calculate the CDF of a variable among a set of observations. The widget would output an array of x, y coordinates that could be visualized as line charts:

The widget may wrap, or derive from, an existing CDF library, such as the Cdf class created by Allen B. Downey

Meta

This widget might appear in an Analyze section of the Orange toolbox, among a few other widgets useful for the analysis stage of a machine learning workflow.

Related resources

• Wikipedia: Cumulative distribution function
• Allen B. Downey: Think Stats Cumulative distribution function sourcecode

[kernc]

This widget might appear in an Analyze section of the Orange toolbox, among a few other widgets useful for the analysis stage of a machine learning workflow.

Why not as a check box in the Distributions widget?

[janezd]

Decision: we'll add a check box to Distributions widget.

[janezd]

Closed via #3766.