S3 Infrastructure for Regular and Irregular Time Series (Z's Ordered Observations) R package zoo version 1.9-0 CRAN Task View: Econometrics (https://CRAN.R-project.org/view=Econometrics) CRAN Task View: Environmetrics (https://CRAN.R-project.org/view=Environmetrics) CRAN Task View: Finance (https://CRAN.R-project.org/view=Finance) CRAN Task View: MissingData (https://CRAN.R-project.org/view=MissingData) CRAN Task View: TimeSeries (https://CRAN.R-project.org/view=TimeSeries) An S3 class with methods for working with regular and irregular time series. The class stores data as numeric vectors/matrices (or factors) along with a time index of arbitrary class (including numeric, Date, POSIXct, chron, yearmon, yearqtr, etc.). Functions and methods are consistent with the ts class and base R and also extend standard generics. Tools include: Data import/export, coercion, visualization (with base R, 'ggplot2', 'lattice', 'tinyplot'), alignment and merging, aggregation, lags and subsets, rolling analytics, and time-based interpolation/filling. The design is introduced in Zeileis and Grothendieck (2005) <doi:10.18637/jss.v014.i06>. Software Depends: R (>= 3.1.0), stats Imports: utils, graphics, grDevices, lattice (>= 0.20-27) Suggests: AER, coda, chron, ggplot2 (>= 3.5.0), knitr, mondate, scales, stinepack, strucchange, timeDate, timeSeries (>= 4021.104), tinyplot, tis, tseries, xts Achim Zeileis <Achim.Zeileis@R-project.org> Comprehensive R Archive Network (CRAN) Achim Zeileis [aut, cre] (ORCID: <https://orcid.org/0000-0003-0918-3766>), Gabor Grothendieck [aut], Jeffrey A. Ryan [aut], Joshua M. Ulrich [ctb], Felix Andrews [ctb] GPL-2 GPL-3 2026-07-31 application/tgz https://CRAN.R-project.org/package=zoo doi:10.32614/CRAN.package.zoo