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  "Description": "Cases are matched to controls in an efficient, optimal and\ncomputationally flexible way. It uses the idea of sub-sampling\nin the level of the case, by creating pseudo-observations of\ncontrols. The user can select between replacement and without\nreplacement, the number of controls, and several covariates to\nmatch upon. See Mamouris (2021)\n<doi:10.1186/s12874-021-01256-3> for an overview.",
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      "title": "Matching case-controls in R using the ccoptimalmatch package",
      "author": "Pavlos Mamouris, Vahid Nassiri",
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        "The R Environment",
        "Setup",
        "Install the ccoptimalmatch package",
        "Load the ccoptimalmatch package",
        "Datasets",
        "Prepare the dataset to be analyzed",
        "Raw data",
        "Step 1: Exact Matching on several variables",
        "Step 2: Create artificial observations and select the range of variables",
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        "Step 4: Order variables",
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