| periods {timeDate} | R Documentation |
Returns start and end dates for a rolling periods
periods(x, period = "12m", by = "1m", offset = "0d") periodicallyRolling(x, period = "52w", by = "4w", offset = "0d") monthlyRolling(x, period = "12m", by = "1m")
x |
an object of class timeDate. |
period |
a span string, consisting of a length integer and a unit value, e.g. "52w" for 52 weeks. |
by |
a span string, consisting of a length integer and a unit value, e.g. "4w" for 4 weeks. |
offset |
a span string, consisting of a length integer and a unit value, e.g. "0d" for no offset. |
Periodically Rolling - Allowed unit values are "m" for 4 weeks, "w" for weeks, "d" for days, "H" for hours, "M" for minutes, and "S" for seconds.
Monthly Calendar Rolling - The only allowed allowed unit value is "m" for monthly periods. Express a quarterly period by "3m", a semester by "6m", a year by "12m" etc.
## Create Time Sequence - x <- timeSequence(from = "2001-01-01", to = "2009-01-01", by = "day") ## Generate Periods - periods(x, "12m", "1m") periods(x, "52w", "4w") ## Roll Periodically - periodicallyRolling(x) ## Roll Monthly - monthlyRolling(x)