- x
Either a vector with time values (in this case, y
must be defined), or a regular time-series
- y
If x
is a vector with time values, y
must contain corresponding observations
- frequency
The frequency of observations per year to use in the Buys-Ballot table. By default frequency=12
which corresponds to monthly samples, and the resulting table has 12 column, one per month
- units
either "years"
(by default), and time is not rescaled, or "days"
, and the time is rescaled to "years" with the function daystoyears()
- datemin
A character string representing the first date, using a format corresponding to dateformat
. For instance, with datemin="04/23/1998"
and dateformat="m/d/Y"
, the first observation is assumed to be made the 23th April 1998. In R, it can also be a POSIXt date (see ?DataTimeClasses
). In this case, dateformat
is not required and is ignored. By default, datemin=NULL
- dateformat
The format used for the date in datemin
. For instance, "d/m/Y"
or "m/d/Y"
(by default). The distinction between "Y" and "y" is not important in Splus, but it is vital in R to use "y" for two-digit years (ex: 89) and "Y" for four-digits years (ex: 1989), or the date will not be correctly converted! In R, you can also use a POSIXt format specification like "%d-%m%Y" for instance (see ?strptime
for a complete description of POSIXt format specification. In both Splus and R, you can also use "mon" for abbreviated months like "mon d Y" for "Apr 20 1965", and "month" for fully-spelled months like "d month Y" for "24 September 2003"
- count
If FALSE
(by default), the Buys-Ballot table is calculated. If TRUE
, the function returns only the number of observations that are used in each cell of the Buys-Ballot table