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  "Description": "An implementation of a single-index regression for\noptimizing individualized dose rules from an observational\nstudy. To model interaction effects between baseline covariates\nand a treatment variable defined on a continuum, we employ\ntwo-dimensional penalized spline regression on an\nindex-treatment domain, where the index is defined as a linear\ncombination of the covariates (a single-index). An unspecified\nmain effect for the covariates is allowed, which can also be\nmodeled through a parametric model. A unique contribution of\nthis work is in the parsimonious single-index parametrization\nspecifically defined for the interaction effect term. We refer\nto Park, Petkova, Tarpey, and Ogden (2020)\n<doi:10.1111/biom.13320> (for the case of a discrete treatment)\nand Park, Petkova, Tarpey, and Ogden (2021) \"A single-index\nmodel with a surface-link for optimizing individualized dose\nrules\" <arXiv:2006.00267v2> for detail of the method. The model\ncan take a member of the exponential family as a response\nvariable and can also take an ordinal categorical response. The\nmain function of this package is simsl().",
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