: Rate-Based

Rate-Based

For the NHPP Rate option under the Data Driven option of a Numeric Source block, the following inputs are required as shown in Figure B.6:

Data Name: The location of the SAS data set or JMP table that contains the data to be used to estimate a cumulative intensity (rate) function.
X: Name of the column in the data set that specifies the subinterval cutoff points $\text{[math]}$ so that the NHPP has an intensity function that is piecewise constant on each subinterval $\text{[math]}$ . The subintervals do not necessarily have equal widths. The NHPP is defined on the time interval $\text{[math]}$ so that $\text{[math]}$ , $\text{[math]}$ , and $\text{[math]}$ is the number of subintervals. The time units must be consistent with the data. For example, if the interval of interest is from 1:00 p.m. to 5:30 p.m., then the interval $\text{[math]}$ is $\text{[math]}$ if the data are in hours or $\text{[math]}$ if the data are in minutes.
Rates: Name of the column in the data set where each value $\text{[math]}$ is the estimated rate of arrivals over each subinterval. Specifically, $\text{[math]}$ is the rate of arrivals over the subinterval $\text{[math]}$ . The length of the Rates column should be one less than the length of the X column. Furthermore, the units of the rates $\text{[math]}$ must be consistent with the rest of the simulation model. For example, if the units used in the model are minutes, then the rates $\text{[math]}$ must be specfied in number of arrivals per minute.

Figure B.6 NHPP Rate Option for the Numeric Source Block