Calculation interval specifications are data frames defining what calculations will be required and summarized from all time intervals. Note: parameters which are not requested may be calculated if it is required for (or computed at the same time as) a requested parameter.
The data frame specifying what to calculate during each time interval
end time must always be given as columns, and
start must be before the
end. Other columns define
the parameters to be calculated and the groupings to apply the
x The potentially updated data frame with the interval calculation specification.