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  "Description": "Implements the efficient estimator of bid-ask spreads from\nopen, high, low, and close prices described in Ardia, Guidotti,\n& Kroencke (JFE, 2024) <doi:10.1016/j.jfineco.2024.103916>. It\nalso provides an implementation of the estimators described in\nRoll (JF, 1984) <doi:10.1111/j.1540-6261.1984.tb03897.x>,\nCorwin & Schultz (JF, 2012)\n<doi:10.1111/j.1540-6261.2012.01729.x>, and Abdi & Ranaldo\n(RFS, 2017) <doi:10.1093/rfs/hhx084>.",
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