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      "title": "Robust and Efficient Optimization Using a Marquardt-Levenberg Algorithm with R Package marqLevAlg",
      "author": "Viviane Philipps, Boris P. Hejblum, Mélanie Prague, Daniel Commenges, Cécile Proust-Lima",
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        "Introduction",
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        "The Marquardt-Levenberg algorithm",
        "Stringent convergence criteria",
        "Derivatives calculation",
        "Special case of a log-likelihood maximization",
        "Implementation",
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        "Implementation of parallel computations",
        "Example",
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        "Joint shared random effect model for a longitudinal marker and a time to event: package JM",
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        "A4. Sensitivity to initial values",
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