Create an interaction of two variables

To look in detail at your data, you sometimes need to create a variable that is the interaction of other categorical variables. You want to know not just how results differ between age groups or education level, but by age × education. The Crunch application lets you do this in just a few clicks by selecting the variables to interact — give the result a name (or accept the default of ‘x by y’) and you’re set.



Interactions can only be made with categorical variables. In future releases you will be able to edit and combine results at the time of creation; now, you may need to make such adjustments after the fact by combining categories.