matchmahal: Match with Mahalanobis
In AnderWilson/smurf: Some Useful R Functions

Description Usage Arguments Value Author(s) See Also

This function finds matches for the events without a strata sing the Mahalanobis distrance and nearest neighbor. It is a wrapper for the matchit function from the MatchIt package.

1	matchmahal(date, casecontrol, matchvars, by, ratio = 1, datewindow, ...)

`date`	A vector of dates.
`casecontrol`	A vector where 1 indentifies events, 0 identifies potential controls, and NA represent non-event days that are not eligible to be matched (e.g. missing data, or excluded for some other reason).
`matchvars`	A matrix where the columns represent variables that will be matched on using the Mahalanobis distrance and nearest neighbor.
`by`	A vector of ids or a matrix with columns as the id variables. The events will be found separately within each unique combination of id variables. This is optional.
`ratio`	The number of control units to be matched to each case. The default is 1. See documentation for matchit for more details.
`datewindow`	A scalar that limits the potential control days to be within a a particular number of days of the range of events. For example, if the events occur on days 100, 101, 150, 151, 152 of the year and datewindow=7 then control days will have day of years in the range of 93 to 159. If missing then all days are eligible.