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Additional Arguments for Full Matching

See help(fullmatch) (part of this information is copied below) or http://www.stat.lsa.umich.edu/~bbh/optmatch.html for details.

• min.controls: The minimum ratio of controls to treatments that is to be permitted within a matched set: should be nonnegative and finite. If min.controls is not a whole number, the reciprocal of a whole number, or zero, then it is rounded down to the nearest whole number or reciprocal of a whole number.

• max.controls: The maximum ratio of controls to treatments that is to be permitted within a matched set: should be positive and numeric. If max.controls is not a whole number, the reciprocal of a whole number, or Inf, then it is rounded up to the nearest whole number or reciprocal of a whole number.

• omit.fraction: Optionally, specify what fraction of controls or treated subjects are to be rejected. If omit.fraction is a positive fraction less than one, then fullmatch() leaves up to that fraction of the control reservoir unmatched. If omit.fraction is a negative number greater than $-1$ , then fullmatch() leaves up to $\vert{\rm omit.fraction}\vert$ of the treated group unmatched. Positive values are only accepted if ${\rm max.controls} >= 1$ ; negative values, only if ${\rm min.controls} <= 1$ . If omit.fraction is not specified, then only those treated and control subjects without permissible matches among the control and treated subjects, respectively, are omitted.

• ...: Additional inputs that can be passed to the fullmatch() function in the optmatch package.