A collection is a set of cases. When you get more data, you need more cases. For example, if you have a collection of students in your class, and a new student joins, that new student becomes a new case.
Method 1
Click in the empty row at the bottom of the case table and type the value of an attribute.
Method 2
1. Choose New Cases… from the Data menu. If that item is not active, click in an object (collection, case table, or graph) to activate it.
2. Type how many cases you want.
3. Click OK or press or to close the box. Fathom makes the new cases.
Method 3
1. Right-click (Windows) or -click (Mac) on your collection, case table, graph, or inspector and choose New Cases… from the resulting contextual menu.
2. Type how many cases you want.
3. Click OK or press or to close the box. Fathom makes the new cases.