{
  "_id": "6a10411aacfb0bcc41c9d5a0",
  "Package": "CTT",
  "Type": "Package",
  "Title": "Classical Test Theory Functions",
  "Version": "2.3.4",
  "Date": "2026-02-09",
  "Maintainer": "John T. Willse <measurementjohn@gmail.com>",
  "Authors@R": "person(given = c(\"John\", \"T.\"),\nfamily = \"Willse\",\nrole = c(\"aut\", \"cre\"),\nemail = \"measurementjohn@gmail.com\")",
  "Description": "A collection of common test and item analyses from a\nclassical test theory (CTT) framework. Analyses can be applied\nto both dichotomous and polytomous data. Functions provide\nreliability analyses (alpha), item statistics, disctractor\nanalyses, disattenuated correlations, scoring routines, and\nempirical ICCs.",
  "License": "GPL (>= 2)",
  "NeedsCompilation": "no",
  "Packaged": {
    "Date": "2026-05-11 07:55:08 UTC",
    "User": "root"
  },
  "Author": "John T. Willse [aut, cre]",
  "Repository": "https://cran.r-universe.dev",
  "Date/Publication": "2026-02-10 06:11:01 UTC",
  "RemoteUrl": "https://github.com/cran/CTT",
  "RemoteRef": "HEAD",
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  "MD5sum": "8dfc6fb7e3b1401e43cec56dbfb9db8f",
  "_user": "cran",
  "_type": "src",
  "_file": "CTT_2.3.4.tar.gz",
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    "author": "John T. Willse <measurementjohn@gmail.com>",
    "committer": "cran-robot <csardi.gabor+cran@gmail.com>",
    "message": "version 2.3.4\n",
    "time": 1770703861
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  "_maintainer": {
    "name": "John T. Willse",
    "email": "measurementjohn@gmail.com"
  },
  "_registered": true,
  "_dependencies": [],
  "_owner": "cran",
  "_selfowned": false,
  "_usedby": 7,
  "_updates": [
    {
      "week": "2026-07",
      "n": 1
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  ],
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    {
      "name": "2.3.4",
      "date": "2026-02-10"
    }
  ],
  "_stars": 1,
  "_userbio": {
    "uuid": 6899542,
    "type": "organization",
    "name": "cran",
    "description": "Unofficial read-only mirror of all CRAN R packages"
  },
  "_downloads": {
    "count": 1684,
    "source": "https://cranlogs.r-pkg.org/downloads/total/last-month/CTT"
  },
  "_mentions": 78,
  "_searchresults": 92,
  "_rbuild": "4.6.0",
  "_assets": [
    "extra/citation.cff",
    "extra/citation.html",
    "extra/citation.json",
    "extra/citation.txt",
    "extra/contents.json",
    "extra/CTT.html",
    "manual.pdf"
  ],
  "_realowner": "cran",
  "_cranurl": false,
  "_releases": [
    {
      "version": "1.0",
      "date": "2008-09-03"
    },
    {
      "version": "2.0",
      "date": "2014-01-25"
    },
    {
      "version": "2.1",
      "date": "2014-02-25"
    },
    {
      "version": "2.3",
      "date": "2017-11-03"
    },
    {
      "version": "2.3.2",
      "date": "2018-02-04"
    },
    {
      "version": "2.3.3",
      "date": "2018-09-12"
    },
    {
      "version": "2.3.4",
      "date": "2026-02-16"
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  ],
  "_exports": [
    "cttICC",
    "disattenuated.cor",
    "distractor.analysis",
    "distractorAnalysis",
    "itemAnalysis",
    "polyserial",
    "reliability",
    "score",
    "score.transform",
    "spearman.brown",
    "subscales"
  ],
  "_datasets": [
    {
      "name": "CTTdata",
      "title": "Example Multiple-Choice Data",
      "object": "CTTdata",
      "file": "CTTdata.rda",
      "class": [
        "data.frame"
      ],
      "fields": [
        "i1",
        "i2",
        "i3",
        "i4",
        "i5",
        "i6",
        "i7",
        "i8",
        "i9",
        "i10",
        "i11",
        "i12",
        "i13",
        "i14",
        "i15",
        "i16",
        "i17",
        "i18",
        "i19",
        "i20"
      ],
      "rows": 100,
      "table": true,
      "tojson": true
    },
    {
      "name": "CTTkey",
      "title": "Example Multiple-Choice Key",
      "object": "CTTkey",
      "file": "CTTkey.rda",
      "class": [
        "character"
      ],
      "fields": [],
      "table": false,
      "tojson": true
    }
  ],
  "_help": [
    {
      "page": "CTT-package",
      "title": "Classical Test Theory Functions",
      "topics": [
        "CTT-package",
        "CTT"
      ]
    },
    {
      "page": "CTTdata",
      "title": "Example Multiple-Choice Data",
      "topics": [
        "CTTdata"
      ]
    },
    {
      "page": "cttICC",
      "title": "Function for producing theoretical and empirical item characteristic curves.",
      "topics": [
        "cttICC"
      ]
    },
    {
      "page": "CTTkey",
      "title": "Example Multiple-Choice Key",
      "topics": [
        "CTTkey"
      ]
    },
    {
      "page": "disattenuated.cor",
      "title": "Function for disattentuated correlation",
      "topics": [
        "disattenuated.cor"
      ]
    },
    {
      "page": "distractor.analysis",
      "title": "Function for item distractor analysis",
      "topics": [
        "distractor.analysis"
      ]
    },
    {
      "page": "distractorAnalysis",
      "title": "Function for item distractor analysis",
      "topics": [
        "distractorAnalysis"
      ]
    },
    {
      "page": "itemAnalysis",
      "title": "Function for item reliability analysis",
      "topics": [
        "itemAnalysis"
      ]
    },
    {
      "page": "polyserial",
      "title": "Function for calculating polyserial correlations",
      "topics": [
        "polyserial"
      ]
    },
    {
      "page": "reliability",
      "title": "Function for item reliability analysis",
      "topics": [
        "reliability"
      ]
    },
    {
      "page": "score",
      "title": "Function to score the response files",
      "topics": [
        "score"
      ]
    },
    {
      "page": "score.transform",
      "title": "Function for transforming scores onto different scales",
      "topics": [
        "score.transform"
      ]
    },
    {
      "page": "spearman.brown",
      "title": "Functions for Spearman-Brown \"Prophecy\" Formula",
      "topics": [
        "spearman.brown"
      ]
    },
    {
      "page": "subscales",
      "title": "Function to create subscales based on a design matrix",
      "topics": [
        "subscales"
      ]
    }
  ],
  "_rundeps": [],
  "_score": 4.512349209243105,
  "_indexed": true,
  "_nocasepkg": "ctt",
  "_universes": [
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