matched_set: matched_set

In PanelMatch: Matching Methods for Causal Inference with Time-Series Cross-Sectional Data

matched_set

Description

matched_set is a constructor for the matched.set class.

Usage

matched_set(matchedsets, id, t, L, t.var, id.var, treatment.var)

Arguments

matchedsets	a list of treated units and matched control units. Each element in the list should be a vector of control unit ids.
id	A vector containing the ids of treated units
t	A vector containing the times of treatment for treated units.
L	integer specifying the length of the lag window used in matching
t.var	string specifying the time variable
id.var	string specifying the unit id variable
treatment.var	string specifying the treatment variable. The constructor function returns a matched.set object. matched.set objects are a modified lists. Each element in the list is a vector of ids corresponding to the control unit ids in a matched set. Additionally, these vectors might have additional attributes – "weights". These correspond to the weights assigned to each control unit, as determined by the specified refinement method. Each element in the list also has a name, which corresponds to the unit id of the treated unit and time of treatment, concatenated together and separated by a period. matched.set objects also have a number of methods defined: summary, plot, and `[`. matched.set objects can be modified manually as long as these conventions (and conventions about other attributes) are maintained. It is important to note that matched.set objects are distinct from PanelMatch objects. matched.set objects are often contained within PanelMatch objects.

Details

Users should never need to use this function by itself. See below for more about matched.set objects.

Value

matched.set objects have additional attributes. These reflect the specified parameters when using the PanelMatch function:

lag	an integer value indicating the length of treatment history to be used for matching. Treated and control units are matched based on whether or not they have exactly matching treatment histories in the lag window.
t.var	time variable name, represented as a character/string
id.var	unit id variable name, represented as a character/string
treatment.var	treatment variable name, represented as a character/string
class	class of the object: should always be "matched.set"
refinement.method	method used to refine and/or weight the control units in each set.
covs.formula	One sided formula indicating which variables should be used for matching and refinement
match.missing	Logical variable indicating whether or not units should be matched on the patterns of missingness in their treatment histories
max.match.size	Maximum size of the matched sets after refinement. This argument only affects results when using a matching method

Author(s)

Adam Rauh <amrauh@umich..edu>, In Song Kim <[e-mail]>, Erik Wang <[e-mail]>, and Kosuke Imai <[e-mail]>

PanelMatch documentation built on June 22, 2024, 10:32 a.m.