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  "Title": "Perform Nonlinear Regression Using 'optim' as the Optimization\nEngine",
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      "title": "OptimModel Vignette",
      "author": "Steven Novick",
      "engine": "knitr::rmarkdown",
      "headings": [
        "Introduction",
        "Pre-specified models",
        "Mean-model functions",
        "Exponential decay (first order)",
        "Exponential decay (first order) with plateau",
        "Exponential decay (second order)",
        "Gompertz model",
        "Four-parameter Hill (4PL) model",
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        "IRWLS",
        "Robust model fit",
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        "User-defined model",
        "Functions of parameters",
        "Detecting outliers with ROUT",
        "Summary",
        "References"
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      "modified": "2025-05-04 23:30:11",
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