refvalIdxByDate {surveillance} | R Documentation |
The reference values are formed base on computatations
of seq
for Date class arguments.
refvalIdxByDate(t0, b, w, epochStr, epochs)
t0 |
A Date object describing the time point |
b |
Number of years to go back in time |
w |
Half width of window to include reference values for |
epochStr |
One of "1 month" , "1 week" or "1 day" |
epochs |
Vector containing the epoch value of the sts/disProg object |
Using the Date class the reference values are formed as follows:
Starting from t0
go i, i= 1,...,b
years back in time.
For each year, go w
epochs back and include from here to
w
epochs after t0
.
In case of weeks we always go back to the closest monday of this date. In case of months we also go back in time to closest 1st of month.
a vector of indices in epochs which match