Audio

"To wrap up our discussion on growth factor models, let’s look at the actual mathematical engine behind the Fratar Method. At first glance, the formula looks complex, but it’s essentially a double-proportional balancing act. The goal is to estimate T {i j}—the future trips between two zones—based on how much both the origin and the destination are expected to grow. Let's break down the components: First, we have the term (t_i and G_i). This represents the total future trip generation for the ori