Special Monthly Series
Functions and methods dealing with special monthly 'timeSeries' objects.
countMonthlyRecords(x) rollMonthlyWindows(x, period = "12m", by = "1m") rollMonthlySeries(x, period = "12m", by = "1m", FUN, ...)
x |
a 'timeSeries' object. |
period |
a character string specifying the rollling period composed by
the length of the period and its unit. As examples: |
by |
a character string specifying the rolling shift composed by
the length of the shift and its unit. As examples: |
FUN |
the function for the statistic to be applied. For example
in the case of aggregation use |
... |
arguments passed to the function |
The function countMonthlyRecords computes a 'timeSeries'
that holds the number of monthly counts of the records.
The function rollMonthlyWindows computes start and end
dates for rolling time windows.
The function rollMonthlySeries computes a static over
rolling periods defined by the function rollMonthlyWindows.
The function countMonthlyRecords returns a 'timeSeries'
object.
The function rollMonthlyWindows returns a list with two
named 'tomeDate' entries: $from and to. An attribute
"control" is added which keeps the start and
end dates of the series.
The function rollMonthlySeries computes the statistics
defined by the function FUN over a rolling window
internally computed by the function rollMonthlyWindows.
Note, the periods may be overlapping, may be dense, or even
may have gaps.
## Load Microsoft Daily Data Set: x <- MSFT ## Count Monthly Records - counts <- countMonthlyRecords(x) counts ## Quaterly Non-Overlapping Time Periods - windows <- rollMonthlyWindows(counts[-1, ], period = "3m", by = "3m") windows ## Nicely Reprint Results as a data.frame - data.frame(cbind(FROM=format(windows$from), TO=format(windows$to))) ## Compute the average number of monthly trading days per quarter - rollMonthlySeries(counts[-1, ], period = "3m", by = "3m", FUN=mean)
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