# zoo v1.4-2

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## 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 with ts and
base R by providing methods to extend standard generics.

## Functions in zoo

Name | Description | |

as.zoo | Coercion from and to zoo | |

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

rollapply | Apply Rolling Functions | |

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

frequency<- | Replacing the Index of Objects | |

index | Extracting/Replacing the Index of Objects | |

is.regular | Check Regularity of a Series | |

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

rollmean | Rolling Means/Maximums/Medians | |

as.Date.numeric | Date Conversion Functions from Numeric, Integer and ts Objects | |

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

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

yearmon | An Index Class for Monthly Data | |

zooreg | Regular zoo Series | |

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

yearqtr | An Index Class for Quarterly Data | |

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

MATCH | Value Matching | |

plot.zoo | Plotting zoo Objects | |

na.approx | Replace NA by Interpolation | |

read.zoo | Reading and Writing zoo Series | |

na.locf | Last Observation Carried Forward | |

ORDER | Ordering Permutation | |

xyplot.zoo | Plot zoo Series with Lattice | |

zoo | Z's Ordered Observations | |

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## Last month downloads

## Details

Date | 2008-01-28 |

LazyLoad | yes |

License | GPL |

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

Packaged | Mon Jan 28 10:40:26 2008; zeileis |

depends | base (>= 2.4.1) , R (>= 2.4.1) , stats |

suggests | chron , DAAG , fCalendar , its , strucchange , tseries , xts |

imports | graphics , grDevices , lattice , utils |

Contributors | Achim Zeileis, Gabor Grothendieck |

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