ts(x, start, end, frequency) as.ts(x) is.ts(x) print(ts.obj, calender, ...) plot(ts.obj, ...)
x
| a vector or matrix the observed time-series values. |
start
| the time of the first observation. |
end
| the time of the last observation. |
frequency
| the number of observations per unit of time. |
ts is used to create time-series objects.
These are vector or matrices with class of "ts"
(and additional attributes) which represent data which
has been sampled at equispaced points in time.
In the matrix case, each column of the matrix x
is assumed to contain a single (univariate) time series.
The value of argument frequency is used when the series
is sampled an interal number of times in each unit time interval.
For example, one could use a value of 7 for frequency when
the data are sampled daily, and the natural time period is a week,
or 12 when the data are sampled monthly
and the natural time period is a year.
start and end can either be integers which correspond
to natural time units, or vectors of two integers, which give
a natural time unit and a (1-based) number of samples into
the time unit.
as.ts and is.ts respectively coerce a vecor
into a time-series and test whether an object is a time series.
Time series have methods associated with the generic
print and plot functions.
The argument calender to the print method
can be used to enable/disable the display of information
about month-names, quarter-names or year when printing.
frequency,
end,
start,
time,
window.