An S3 class with methods for totally ordered indexed
observations. It is particularly aimed at irregular time series
of numeric vectors/matrices and factors. zoo's key design goals
are independence of a particular index/date/time class and
consistency with ts and base R by providing methods to extend
standard generics.
coda, chron, DAAG, fCalendar, fSeries, fts, its, lattice,
strucchange, timeDate, timeSeries, tis, tseries, xts
stats, utils, graphics, grDevices, lattice