Explanation for diagrams

The diagram is made up of three overlapping circles that is used to show
relationships between sets of information. In this example the diagram is used to show the relationships between specific weight, protein content and Hagberg falling numbers for wheat, or nitrogen, screenings and moisture content for barley. When this principle is applied to sample data held in the Cereal Quality Survey database a picture emerges of the availability of certain grades of wheat on a regional basis.

Example
Select the following options
1. Wheat
2. 2003
3. Eastern region
4. Hereward
 

And then move the top slide rule to 76kg/hl specific weight, the middle slide rule to 250 Hagberg falling number and the bottom slide rule to 13 % protein. The '<' and '>' buttons allow you to specify whether you want to calculate values greater or less than the number on the slide rule.

Then click on the ‘calculate results‘ button at the bottom of the page.

The numbers within each part of the diagram will have changed. They show that
66% of samples of Hereward samples in the Eastern region have specific weight values higher than 76kg/hl (irrespective of Hagberg & Protein), 77 % of samples meet both 76kg specific weight and 13% Protein and 66% of samples meet all three criteria of 13% protein 250 Hagberg falling number and 76kg/hl specific weight.

Repeat the above procedure for any variables you want.