The logic of specifying models in STATISTICA is as follows:

Refer to factors in the table by their respective numbers.

Use those numbers in order to specify main effects and interactions. For example, in order to specify a model with no interactions but only main effects for each of three factors, enter 1 2 3 (separated by spaces or commas).

In order to specify a model with a 2-way interaction between factors 1 and 3, and the main effect for factor 2, enter 1 3 2 (or 2 3 1; the order does not matter).

Higher-order interactions are specified analogously (e.g., 124 134 15). After exiting the dialog via OK, STATISTICA will begin to estimate the model.