Time Scale Version, Vector Prediction

Scalar predictions using time scales are almost identical to those using event scales. Vector predictions using time scales are different but similar. The time scale model (2.54) is an alternative to the event scale model (2.52). It follows from (2.55) that in the time scale model the next day call rate graph $z_i=(z_{ij},\j=1,...,J)$ differ only by scales $s_{i-1}$ from the graph of the preceding day $p(i)$.

Scales $s_{i-1}$ of the present period $i-1$ defines changes of average call rates during the time between the present period and that of the preceding one. The scales are estimated using empirical data and/or expert opinion. The definitions and examples of all the special events are the same as in the Event Scale case (see the section 2.12.3).