Written by on Friday June 29th 2012 in SIMUL8 Tips, Technical Corner

SIMUL8 Tip – What’s The Difference Between Arrival Rates and Inter Arrival Times?

We have a really great tip for you today. We’ve heard that sometimes users get confused between arrival rates and inter-arrival times.

Well, let’s clarify this for you; the inter arrival time is a key option in the Start Point of any simulation, therefore it’s really important that users know the difference before they start simulating.



The arrival rate is calculated from the following equation;

arrival rate = 1/inter arrival time

 

The neat trick with this equation is that if you invert the arrival rate your answer is the inter arrival time which can then be used in your simulation.

inter arrival time = 1/arrival rate

 

For example;

If 12 customers enter a store per hour, the time between each arrival is;
 
inter arrival time = 1/arrival rate

= 1/12

= 0.083(hours)

= 0.083 x 60 minutes

= 5 (minutes)
 
Therefore from the arrival rate of 12 per hour, the time between each arrival is 5 minutes.


We hope you found this tip useful!