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  "Title": "Simultaneous-Equations Hazard/Probit Models with a\nGaussian-Copula Correlation",
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  "Authors@R": "person(\"Nobutaka\", \"Fukuda\", email = \"nobutaka.fukuda@tohoku.ac.jp\",\nrole = c(\"aut\", \"cre\"))",
  "Description": "Fits two-equation simultaneous models in the style of\nLillard (1993) <doi:10.1016/0304-4076(93)90106-F>: a pair of\nprocesses, each either a binary probit outcome or a\ncontinuous-time hazard duration, linked through a single\ncorrelation parameter between their underlying error terms and\nestimated jointly by maximum likelihood via a Gaussian copula.\nEquation 1 may be a probit, a log-normal\naccelerated-failure-time hazard, or a piecewise\n(linear-log-hazard) Gompertz hazard with an arbitrary,\nuser-specified number of segments; equation 2 is always a\nhazard, log-normal or piecewise Gompertz. Models can also be\nfit under independence (correlation fixed at zero), which\nreduces exactly to two separate univariate fits. See the\npackage vignette/manual for the full likelihood derivation and\na simulation-based verification.",
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