Apply a specified function to each distinct period in a given time series object.
apply.daily(x, FUN, ...)
apply.weekly(x, FUN, ...)
apply.monthly(x, FUN, ...)
apply.quarterly(x, FUN, ...)
apply.yearly(x, FUN, ...)an time-series object coercible to xts
an R function
additional arguments to FUN
A vector of results produced by FUN, corresponding
to the appropriate periods.
Simple mechanism to apply a function to non-overlapping time periods, e.g. weekly, monthly, etc. Different from rolling functions in that this will subset the data based on the specified time period (implicit in the call), and return a vector of values for each period in the original data.
Essentially a wrapper to the xts functions
endpoints and period.apply, mainly as
a convenience.
# NOT RUN {
xts.ts <- xts(rnorm(231),as.Date(13514:13744,origin="1970-01-01"))
start(xts.ts)
end(xts.ts)
apply.monthly(xts.ts,mean)
apply.monthly(xts.ts,function(x) var(x))
# }