Dear Erik,
I think one could argue that a "sample" taken *on* the second is most
representative of an interval extending from half a second prior to the
sample time and half a second following the sample time, so, for
example, a sample at 1 sec represents the interval from 0.5 to 1.5
seconds.? In that case if your 1st sample is at 23:10:00 and last sample
is at 23:19:59, you might want to set the bounds on your 10-minute mean
as 23:09:59.5 and 23:19:59.5.
On the other hand, if there is some finite response response time of
your instrument (say, of order 1 sec), you could argue that a sample
taken at time t really represents an average over some preceding
interval, and then you might say your 10-minute mean extends from
23:09:59 to 23:19:59.? In this case I would be tempted to compute
10-minute means from samples starting with 23:10:01and ending with
23:20:00, so the bounds would be 23:10:00 and 23:20:00.
In any case the bounds should span exactly 10 minutes, I think.
These suggestions come from someone? unfamiliar with observational
protocols, so take them for what they're worth.
regards,
Karl
On 3/26/18 7:26 AM, Jim Biard wrote:
> Erik,
>
> Bounds are always inclusive lower / exclusive upper. That's [low,
> high) in common notation. If the cells abut one another, the upper
> bound for one should be identical to the lower bound for then next.
>
> Grace and peace,
>
> Jim
>
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> On Mon, Mar 26, 2018 at 4:29 AM, Erik Quaeghebeur
> <E.R.G.Quaeghebeur at tudelft.nl <mailto:E.R.G.Quaeghebeur at tudelft.nl>>
> wrote:
>
> Dear list,
>
>
> Is there a standard way to indicate which bounds are included in a
> bounds variable?
>
> Context: I have 10-min. statistics, e.g., the mean of 600
> per-second samples from 23:10:00 to 23:19:59. Currently, in my
> bounds variable for time, I have, essentially, [23:10:00,
> 23:20:00]. I list my time in seconds since 1970-01-01. Should I
> use [23:10:00, 23:19:59] instead?
>
>
> Best,
>
> Erik
>
> --
> https://ac.erikquaeghebeur.name <https://ac.erikquaeghebeur.name>
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