Partial Discrete Group Effect

A Partial Discrete Group Effect is selected by the menu selections FillCol | Group Effect | Partial Discrete choices in the design matrix. The current column plus enough additional columns are filled with a discrete group effect. A group effect is set up as ones repeated for the number of re-encounter occasions, followed by zeros repeated for the number of re-encounter occasions. As an example, suppose the following design matrix is on the screen, consisting of all zeros, and there are 2 re-encounter occasions and 3 groups. The cursor is in the highlighted (underlined) cell.

After the cells are filled, the matrix would look like the following, with group effects in columns 4 and 5. Only 2 columns are required to specify a group effect for 3 groups, with the third group defaulting to zero.