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#16
May 19th, 2003, 03:29 PM
 epl
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sorry if i'm repeating myself a bit here but i'll try again anyway.
what i'm trying to say is that the poission distribution models a count of the number of events occurring within a given interval.

what you want to do, as far as i can judge, is to model the length of interval between events - this is, as i remember not what the poission distribution is used for - the exponential distribution models this.

#17
May 19th, 2003, 04:39 PM
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Quote:
 what i'm trying to say is that the poission distribution models a count of the number of events occurring within a given interval.

ok. the 'e', which is the event, occurs on avarage per interval 0.1794872 times - the way that's now stated fits with what you've said there.

Code:
```m = 0.179487  (average number of random occurrences per interval)
Probability of occurrences in intervals :
------------------------------------------------------------------
0: 0.835699   83.57%    < probability of no occurance
1: 0.149997   15.00%
2: 0.013461   1.35%
3: 0.000805   0.08%
4: 0.000036   0.00%
5: 0.000001   0.00%
6: 0.000000   0.00%
7: 0.000000   0.00%
8: 0.000000   0.00%
9: 0.000000   0.00%
10: 0.000000   0.00%```

but that isn't much use really :/ not that i can see anyway. oh well.

well, if it doesn't fit or work, it doesn't work. fair enough. although i'm still not *completely* convinced a poisson formula can't be used for this in some way, but i see your point definetely.

Quote:
 what you want to do, as far as i can judge, is to model the length of interval between events - this is, as i remember not what the poission distribution is used for - the exponential distribution models this.

yeah, or the number of intervals more precisely.

ok, i will look into exponential distribution models.

thanks very much for the info and reply

#18
May 19th, 2003, 04:47 PM
 theFish
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no probs on my part... let us know how ya get on...

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