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Is there any difference between inter-arrival time and interval time?

Hi

I am wondering some statistical books write inter-arrival time and other write interval time.
Is there any difference between them? if so, how can I calculate both?

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TommySzalapski

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TommySzalapski

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amq10

ASKER

Hi Tommy,

is the inerval like arrival rate ?

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TommySzalapski

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amq10

ASKER

Tommy,

I have arrival time like the below:
10:30
10:32
11:02
11:25

for more than 3000 requests. I need to get lambda to calculate the Poisson distribution. can you help me how can get that ?

TommySzalapski

lambda is just the average time between events. So divide the number of events by the total time.

If you have a start and end time, use total_requests/(end_time - start_time)

If you just have the times, then use (total_requests-1)/(last_request_time - first_request_time)
You subtract 1 because you have no way of knowing (in this case) how long it took for the first event to happen.

amq10

ASKER

Thanks you. it is so clear