{
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  "Date": "2026-09-26",
  "Title": "S3 Infrastructure for Regular and Irregular Time Series (Z's\nOrdered Observations)",
  "Authors@R": "c(person(given = \"Achim\", family = \"Zeileis\", role = c(\"aut\", \"cre\"), email = \"Achim.Zeileis@R-project.org\", comment = c(ORCID = \"0000-0003-0918-3766\")),\nperson(given = \"Gabor\", family = \"Grothendieck\", role = \"aut\", email = \"ggrothendieck@gmail.com\"),\nperson(given = c(\"Jeffrey\", \"A.\"), family = \"Ryan\", role = \"aut\", email = \"jeff.a.ryan@gmail.com\"),\nperson(given = c(\"Joshua\", \"M.\"), family = \"Ulrich\", role = \"aut\", email = \"josh.m.ulrich@gmail.com\"),\nperson(given = \"Felix\", family = \"Andrews\", role = \"ctb\", email = \"felix@nfrac.org\"))",
  "Description": "An S3 class with methods for working with regular and\nirregular time series. The class stores data as numeric\nvectors/matrices (or factors) along with a time index of\narbitrary class (including numeric, Date, POSIXct, chron,\nyearmon, yearqtr, etc.). Functions and methods are consistent\nwith the ts class and base R and also extend standard generics.\nTools include: Data import/export, coercion, visualization\n(with base R, 'ggplot2', 'lattice', 'tinyplot'), alignment and\nmerging, aggregation, lags and subsets, rolling analytics, and\ntime-based interpolation/filling. The design is introduced in\nZeileis and Grothendieck (2005) <doi:10.18637/jss.v014.i06>.",
  "License": "GPL-2 | GPL-3",
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  "BugReports": "https://codeberg.org/zeileis/zoo/issues",
  "Repository": "https://zeileis.r-universe.dev",
  "Date/Publication": "2026-10-04 19:40:48 UTC",
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  "Author": "Achim Zeileis [aut, cre] (ORCID:\n<https://orcid.org/0000-0003-0918-3766>),\nGabor Grothendieck [aut],\nJeffrey A. Ryan [aut],\nJoshua M. Ulrich [aut],\nFelix Andrews [ctb]",
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  "_created": "2026-11-03T13:36:03.000Z",
  "_published": "2026-11-03T13:42:45.842Z",
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        "as.zooreg.default",
        "as.zooreg.its",
        "as.zooreg.ts",
        "as.zooreg.xts",
        "as.zooreg.zoo"
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    },
    {
      "page": "coredata",
      "title": "Extracting/Replacing the Core Data of Objects",
      "topics": [
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        "coredata.default",
        "coredata.irts",
        "coredata.its",
        "coredata.ts",
        "coredata.zoo",
        "coredata<-",
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        "coredata<-.its",
        "coredata<-.ts",
        "coredata<-.zoo"
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    {
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      "topics": [
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        "frequency<-.zoo",
        "frequency<-.zooreg"
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    },
    {
      "page": "ggplot2.zoo",
      "title": "Convenience Functions for Plotting zoo Objects with ggplot2",
      "topics": [
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        "facet_free",
        "fortify.zoo",
        "ggplot2.zoo",
        "scale_type.yearmon",
        "scale_type.yearqtr",
        "scale_x_yearmon",
        "scale_x_yearqtr",
        "scale_y_yearmon",
        "scale_y_yearqtr",
        "yearmon_trans",
        "yearqtr_trans"
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    },
    {
      "page": "index",
      "title": "Extracting/Replacing the Index of Objects",
      "topics": [
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        "index",
        "index.default",
        "index.ts",
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        "index2char",
        "index<-",
        "index<-.zoo",
        "start.zoo",
        "time.zoo",
        "time<-",
        "time<-.zoo"
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    },
    {
      "page": "is.regular",
      "title": "Check Regularity of a Series",
      "topics": [
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        "is.regular.default",
        "is.regular.ts",
        "is.regular.zoo",
        "is.regular.zooreg"
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    },
    {
      "page": "lag.zoo",
      "title": "Lags and Differences of zoo Objects",
      "topics": [
        "diff.zoo",
        "lag.zoo"
      ]
    },
    {
      "page": "lattice-deprecated",
      "title": "Deprecated Time Series Panel Methods for Lattice",
      "topics": [
        "panel.lines.its",
        "panel.lines.tis",
        "panel.lines.ts",
        "panel.lines.zoo",
        "panel.plot.custom",
        "panel.plot.default",
        "panel.points.its",
        "panel.points.tis",
        "panel.points.ts",
        "panel.points.zoo",
        "panel.polygon.its",
        "panel.polygon.tis",
        "panel.polygon.ts",
        "panel.rect.its",
        "panel.rect.tis",
        "panel.rect.ts",
        "panel.segments.its",
        "panel.segments.tis",
        "panel.segments.ts",
        "panel.text.its",
        "panel.text.tis",
        "panel.text.ts",
        "panel.text.zoo"
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    },
    {
      "page": "make.par.list",
      "title": "Make a List from a Parameter Specification",
      "topics": [
        "make.par.list"
      ]
    },
    {
      "page": "MATCH",
      "title": "Value Matching",
      "topics": [
        "MATCH",
        "MATCH.Date",
        "MATCH.default",
        "MATCH.POSIXct",
        "MATCH.POSIXlt",
        "MATCH.timeDate",
        "MATCH.times"
      ]
    },
    {
      "page": "merge.zoo",
      "title": "Merge Two or More zoo Objects",
      "topics": [
        "c.zoo",
        "cbind.zoo",
        "merge.zoo",
        "rbind.zoo"
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    },
    {
      "page": "na.aggregate",
      "title": "Replace NA by Aggregation",
      "topics": [
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        "na.aggregate.default"
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    {
      "page": "na.approx",
      "title": "Replace NA by Interpolation",
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        "na.approx.default",
        "na.approx.ts",
        "na.approx.zoo",
        "na.approx.zooreg",
        "na.spline",
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        "na.spline.ts",
        "na.spline.zoo",
        "na.spline.zooreg"
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      "page": "na.fill",
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        "na.fill.zoo",
        "na.fill0"
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    {
      "page": "na.locf",
      "title": "Last Observation Carried Forward",
      "topics": [
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        "na.locf.data.frame",
        "na.locf.default",
        "na.locf.list",
        "na.locf0"
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    {
      "page": "na.StructTS",
      "title": "Replace NA by Kalman Filter",
      "topics": [
        "na.StructTS",
        "na.StructTS.ts",
        "na.StructTS.zoo"
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    },
    {
      "page": "na.trim",
      "title": "Trim Leading/Trailing Missing Observations",
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        "na.trim",
        "na.trim.default",
        "na.trim.ts"
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    },
    {
      "page": "ORDER",
      "title": "Ordering Permutation",
      "topics": [
        "ORDER",
        "ORDER.default"
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    {
      "page": "plot.zoo",
      "title": "Plotting zoo Objects",
      "topics": [
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        "boxplot.zoo",
        "lines.zoo",
        "plot.zoo",
        "points.zoo"
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    },
    {
      "page": "read.zoo",
      "title": "Reading and Writing zoo Series",
      "topics": [
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        "read.csv2.zoo",
        "read.delim.zoo",
        "read.delim2.zoo",
        "read.table.zoo",
        "read.zoo",
        "write.zoo"
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    {
      "page": "rollapply",
      "title": "Apply Rolling Functions",
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        "rollapply.default",
        "rollapply.ts",
        "rollapply.zoo",
        "rollapplyr"
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      "page": "rollmean",
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        "rollmax.default",
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        "rollmax.zoo",
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        "rollsum.ts",
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        "rollsumr"
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      "page": "tinyplot.zoo",
      "title": "Plotting zoo Objects with tinyplot",
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    {
      "page": "window.zoo",
      "title": "Extract/Replacing the Time Windows of Objects",
      "topics": [
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        "window<-.zoo"
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    {
      "page": "xblocks",
      "title": "Plot Contiguous Blocks along x Axis",
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        "xblocks.default",
        "xblocks.ts",
        "xblocks.zoo"
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      "page": "xyplot.zoo",
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      "title": "An Index Class for Quarterly Data",
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        "Example 4",
        "Example 5",
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        "Example 7",
        "Example 8",
        "Example 9",
        "Example 10",
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        "1. I know that duplicate times are not allowed but my data has them. What do I do?",
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        "3. How do I create right and a left vertical axes in plot.zoo?",
        "4. I have data frame with both numeric and factor columns.  How do I convert that to a \"zoo\" object?",
        "5. Why does lag give slightly different results on a \"zoo\" and a \"zooreg\" series which are otherwise the same?",
        "6. How do I subtract the mean of each month from a \"zoo\" series?",
        "7. How do I create a monthly series but still keep track of the dates?",
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        "11. What other packages use zoo?",
        "12. Why does ifelse not work as I expect?",
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        "What is the difference between as.Date in zoo and as.Date in the core of R?",
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      "created": "2026-07-15 21:09:23",
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