{
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  "Package": "diffIRT",
  "Type": "Package",
  "Title": "Diffusion IRT Models for Response and Response Time Data",
  "Version": "1.5",
  "Date": "2015-08-13",
  "Author": "Dylan Molenaar",
  "Maintainer": "Dylan Molenaar <d.molenaar@uva.nl>",
  "Description": "Package to fit diffusion-based IRT models to response and\nresponse time data. Models are fit using marginal maximum\nlikelihood. Parameter restrictions (fixed value and equality\nconstraints) are possible. In addition, factor scores (person\ndrift rate and person boundary separation) can be estimated.\nModel fit assessment tools are also available. The traditional\ndiffusion model can be estimated as well.",
  "License": "GPL-2",
  "NeedsCompilation": "yes",
  "Packaged": {
    "Date": "2026-05-10 05:47:32 UTC",
    "User": "root"
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  "Repository": "https://cran.r-universe.dev",
  "Date/Publication": "2015-08-13 00:00:00 UTC",
  "RemoteUrl": "https://github.com/cran/diffIRT",
  "RemoteRef": "HEAD",
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  "MD5sum": "abe270e79d20cf3b0c9a9b457be397db",
  "_user": "cran",
  "_type": "src",
  "_file": "diffIRT_1.5.tar.gz",
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  "_published": "2026-05-22T12:45:38.151Z",
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  "_commit": {
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    "author": "Dylan Molenaar <d.molenaar@uva.nl>",
    "committer": "Gabor Csardi <csardi.gabor@gmail.com>",
    "message": "version 1.5\n",
    "time": 1439424000
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  "_maintainer": {
    "name": "Dylan Molenaar",
    "email": "d.molenaar@uva.nl"
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  "_dependencies": [
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      "package": "statmod",
      "role": "Depends"
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  "_owner": "cran",
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  "_usedby": 0,
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    "name": "cran",
    "description": "Unofficial read-only mirror of all CRAN R packages"
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    "source": "https://cranlogs.r-pkg.org/downloads/total/last-month/diffIRT"
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  "_assets": [
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    "extra/citation.html",
    "extra/citation.json",
    "extra/citation.txt",
    "extra/contents.json",
    "extra/diffIRT.html",
    "manual.pdf"
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  "_realowner": "cran",
  "_cranurl": false,
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      "date": "2013-11-05"
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      "date": "2014-06-05"
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    "QQdiff",
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      "title": "A Simulated Response Time Dataset according to an Experimental Design",
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  "_help": [
    {
      "page": "anova",
      "title": "Conduct a likelihood ratio test on two nested 'diffIRT' models",
      "topics": [
        "anova.diffIRT"
      ]
    },
    {
      "page": "brightness",
      "title": "A Simulated Response Time Dataset according to an Experimental Design",
      "topics": [
        "brightness"
      ]
    },
    {
      "page": "coef",
      "title": "Return estimated parameters",
      "topics": [
        "coef.diffIRT"
      ]
    },
    {
      "page": "diffIRT",
      "title": "Fitting diffusion IRT models",
      "topics": [
        "diffIRT"
      ]
    },
    {
      "page": "extraversion",
      "title": "Responses and Response Times to 10 Extraversion Items",
      "topics": [
        "extraversion"
      ]
    },
    {
      "page": "factest",
      "title": "Estimating factor scores for diffIRT models",
      "topics": [
        "factest"
      ]
    },
    {
      "page": "QQdiff",
      "title": "Assessing diffIRT model fit for the response times using QQ-plots",
      "topics": [
        "QQdiff"
      ]
    },
    {
      "page": "RespFit",
      "title": "Assessing diffIRT model fit for the responses using limited information goodness-of-fit testing.",
      "topics": [
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    },
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      "page": "rotation",
      "title": "Responses and Response Times to 10 Mental Rotation Items",
      "topics": [
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      ]
    },
    {
      "page": "simdiffT",
      "title": "Simulate data according to the traditional diffusion model.",
      "topics": [
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      ]
    },
    {
      "page": "summary",
      "title": "Summary function for diffIRT objects",
      "topics": [
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