Transportation Statistics and Microsimulation

Microsimulation    ◾    297

The above equations are presented for a single time period. It is often

valuable to apply the selected measure of performance for discrete

time periods. For example, when simulating a four-hour peak period,

it may be desirable to report performance measures for each one-hour

or thirty-minute period so that trends may be examined over time.

In this situation the aggregate performance measure is calculated for

each time period. For example, the disaggregate MAE for time period

t (MAE

t

) is shown in Equation 15.4.

MAE

N

OE tT

t

t

it it

i

N

t

=−=

=

∑

1

1

1

,.

MAE

MAE

T

t

t

T

=

=

∑

1

(15.4)

where:

t Time period t; note all time periods are ...