Interactions

This dialogue is for selecting interaction that needs to be calculated.

Example

The Matrix indicates that Column C (pink means error) can not be used because that it is be used by the interaction. A bigger orthogonal matrix is needed. The indication of errors in the array is only been displayed when the checkbox Check is on in the statistical mode plane.

With a bigger matrix it is possible to calculate the interaction.


The not used Columns can be removed. This is the result with measure data.


Adding a extra interaction between D and G the interaction dialogue will indicate that there is an error because both interactions interact with each other.

External links

• http://www.itl.nist.gov/div898/handbook/pri/section6/pri623.htm
• http://en.wikipedia.org/wiki/Interaction_%28statistics%29