What are Derived Collections?

Briefly

There are several types of derived collection. Derived collections get their data from somewhere else, called their source.

Types of Derived Collections

In each case, you control the specifics of how the collection is derived in the corresponding pane in its inspector. Click on the name of each type to learn more.

Sample

The cases in the collection are sampled from the source collection.

Collect Measures

Cases enter this collection one at a time. Their case attributes are the same as the measures of the source collection.

Scramble

The cases in the collection are identical to the cases in the source collection except that the values of one attribute are scrambled.

Stack

This collection creates one case from each value in each attribute in the source.

All of the above are derived from data in Fathom (ultimately, collections). But there is a fifth kind of "derived" collection we list here for completeness:

Import This collection is read in from a text file or from the Internet.