#### quantifying overlapping time spans

```Hi all,

I am trying to write a query to calculate the amount of time that any two
individuals overlap in their use of a location. My table currently looks like
this:

Date   Time   IndividualID   ArrivalTime   DepartureTime

Individuals can arrive and depart at different times, and stay for different
amounts of time. Individuals remain at the location for as little as a few
seconds or up to 20 minutes. I am trying to determine the following:

1) for each pair of individuals, how much time were they both at the location?
(shared presence)

I need the results to appear something like this:

Individual1   Individual2    SharedPresence (in minutes)
A                     B             0.2
A                     C             1.4
A                     D             10.0
B                     C              4.2
B                     D              0.9
....etc.

2) at any one time point, I need to be able to determine all of the
individuals present

Any ideas? I have some experience with Access and writing queries, but
haven't gotten into writing macros or anything like that. Any comments or
suggestions would be very appreciated.

Liz

--
Message posted via AccessMonster.com
http://www.accessmonster.com/Uwe/Forums.aspx/access-modules/201006/1

```
 0
EHobs
6/4/2010 11:46:56 PM
access.modulesdaovba 1670 articles. 0 followers.

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```EHobs via AccessMonster.com wrote:
>I am trying to write a query to calculate the amount of time that any two
>individuals overlap in their use of a location. My table currently looks like
>this:
>
>Date   Time   IndividualID   ArrivalTime   DepartureTime
>
>Individuals can arrive and depart at different times, and stay for different
>amounts of time. Individuals remain at the location for as little as a few
>seconds or up to 20 minutes. I am trying to determine the following:
>
>1) for each pair of individuals, how much time were they both at the location?
>(shared presence)
>
>I need the results to appear something like this:
>
>Individual1   Individual2    SharedPresence (in minutes)
>A                     B             0.2
>A                     C             1.4
>A                     D             10.0
>B                     C              4.2
>B                     D              0.9
>...etc.
>
>
>2) at any one time point, I need to be able to determine all of the
>individuals present

To find all overlaps you can use comparisons like:
start1 < end2 And start2 < end1
and the duration of the overlap can be calculated with an
expression like:
((end1 - start1) + (end2 - start2) - Abs(start1 - start2)
- Abs(end1 - end2)) / 2

This can all be done with a query:

SELECT table.IndividualID As Individual1,
X.IndividualID As Individual2,
(DateDiff("n", table.ArrivalTime, table.DepartureTime)
+ DateDiff("n", X.ArrivalTime, X.DepartureTime)
- Abs(DateDiff("n", table.ArrivalTime, X.ArrivalTime)
- AbsDateDiff("n", table.DepartureTime,
X.DepartureTime)
) / 2 As SharedPresence
FROM table, table As X
WHERE table.IndividualID <> X.IndividualID
And table.ArrivalTime < X.DepartureTime
And X.ArrivalTime < table.DepartureTime

To find all the individuals at any point in time, the query
is simpler:

SELECT table.IndividualID
FROM table
WHERE [Enter Time] Between table.ArrivalTime
And table.DepartureTime
--
Marsh
MVP [MS Access]
```
 0
Marshall
6/5/2010 1:02:22 PM

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