# TPPE99

## Conceptual modeling:

Develop an understanding of the problem situation

Determine the modeling objectives

Design the conceptual model: inputs, outputs and model content

Collect and analyze the data required to develop the model

General objectives: Flexibility, Run-speed, Visual display, and Ease-of-use.

Model Scope: Table with Entities, Activities, Queues, and Resources

## Properties of Pseudo Random Numbers (PRN)

IID (Independent and Identically Distributed)

PRN is not random, but behaves as random numbers

Seed (starting value of random number generator)

Identical seed makes identical Random Number Streams

Looping

Repetition of random numbers in a Random Number Stream

Overlapping

A majority of the random numbers are identical. Random number seeds may be two consecutive random numbers in the stream.

## Random number generator:

An algorithm where a previous random number is used to calculate the next number.

## IID (Independent and Identically Distributed):

This is data that are sampled from the same underlying distribution and independent from each other. Usually, output data from different replications must be IID to use simple statistical tools.