# zoo v1.7-0

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## S3 Infrastructure for Regular and Irregular Time Series (Z's ordered observations)

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.

## Functions in zoo

Name | Description | |

coredata | Extracting/Replacing the Core Data of Objects | |

frequency<- | Replacing the Index of Objects | |

yearqtr | An Index Class for Quarterly Data | |

xyplot.zoo | Plot zoo Series with Lattice | |

MATCH | Value Matching | |

na.approx | Replace NA by Interpolation | |

plot.zoo | Plotting zoo Objects | |

zoo | Z's Ordered Observations | |

read.zoo | Reading and Writing zoo Series | |

as.zoo | Coercion from and to zoo | |

window.zoo | Extract/Replacing the Time Windows of Objects | |

rollapply | Apply Rolling Functions | |

na.fill | Fill NA or specified positions. | |

merge.zoo | Merge Two or More zoo Objects | |

na.trim | Trim Leading/Trailing Missing Observations | |

xblocks | Plot contiguous blocks along x axis. | |

make.par.list | Make a List from a Parameter Specification | |

ORDER | Ordering Permutation | |

rollmean | Rolling Means/Maximums/Medians | |

is.regular | Check Regularity of a Series | |

na.StructTS | Fill NA or specified positions. | |

yearmon | An Index Class for Monthly Data | |

lag.zoo | Lags and Differences of zoo Objects | |

aggregate.zoo | Compute Summary Statistics of zoo Objects | |

index | Extracting/Replacing the Index of Objects | |

zooreg | Regular zoo Series | |

na.aggregate | Replace NA by Aggregation | |

na.locf | Last Observation Carried Forward | |

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## Last month downloads

## Details

Date | 2011-07-12 |

License | GPL-2 |

URL | http://zoo.R-Forge.R-project.org/ |

Packaged | 2011-07-12 15:51:04 UTC; zeileis |

Repository | CRAN |

Date/Publication | 2011-07-12 17:51:35 |

depends | base (>= 2.10.0) , R (>= 2.10.0) , stats |

suggests | chron , coda , DAAG , fCalendar , fSeries , fts , its , strucchange , timeDate , timeSeries , tis , tseries , xts |

imports | graphics , grDevices , lattice (>= 0.18-1) , utils |

Contributors | Achim Zeileis, Felix Andrews, G. Grothendieck, Jeffrey Ryan |

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