# Tutorial:Q-Q Plot

### From Howto Wiki

## Summary

Q-Q plot is a graphic method to test whether or not a dataset follows a given distribution. In a Q-Q plot, observed values on X axis and expected values on Y axis are shown. If all the scatter points are close to the reference line, we can conclude that the dataset follows the given distribution.

Minimum Origin Version Required: Origin 8.1 SR0

## What you will learn

- How to create a normal Q-Q plot
- How to change the color and shape of the symbol
- How to change the color of the line

## Steps

This tutorial is associated with the Statistical and Specialized Graphs project:*\Samples\Statistical and Specialized Graphs.opj*. (If you don't have the OPJ, you can also download the data from here)

- Open the Statistical and Specialized Graphs project, open the folder
*Statistical and Specialized Graphs: Statistical: Probability, QQ Plot*in the**Project Explorer**. Activate worksheet*Q-Q Plot Data*, highlight column A and right-click to select**Set As: Y**from the context menu.

- Add a long name to this column, say
**Normal Random Values**.

- Highlight this column and select
**Plot: Statistics: Q-Q Plot**from the Origin main menu to open the**plot_prob**dialog. In this dialog, change**Score Method**to**Benard**.

- Click the
**OK**button to create a normal Q-Q plot with column A.

Categories: Statistical (Tutorials) | Tutorials for Graph Gallery | Tutorials for Sample OPJs | P1

Documentation

Documentation

Documentation > Process Status > P1

Samples > Tutorials for Graph Gallery

Samples > Tutorials for Sample OPJs

Tutorials 8.5.1 > Graphing (Tutorials) > Statistical (Tutorials)