getWits

getWits
returns a vector of Wits, as defined in the paper (equation 25 or equation 23). They should be in the same order as the data frame containing the original problem data. The pts, pcs, and getWits functions act for a specific lead. So, for instance if our lead window is 0,1,2,3,4, these function must be called for each of those -- so for 0, then for 1, etc.

internal

Implements a set of methodological tools
that enable researchers to apply matching methods to
time-series cross-sectional data. Imai, Kim, and Wang
(2023) <http://web.mit.edu/insong/www/pdf/tscs.pdf>
proposes a nonparametric generalization of the
difference-in-differences estimator, which does not rely
on the linearity assumption as often done in
practice. Researchers first select a method of matching
each treated observation for a given unit in a
particular time period with control observations from
other units in the same time period that have a similar
treatment and covariate history. These methods include
standard matching methods based on propensity score and
Mahalanobis distance, as well as weighting methods. Once
matching and refinement is done,
treatment effects can be estimated with
standard errors. The package also offers diagnostics for researchers to assess the quality
of their results.

In Kim

PanelMatch

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

In Song Kim

Adam Rauh

Erik Wang

Kosuke Imai

getWits function

<dl><dt>matched_sets</dt>
<dd>matched.set object</dd>
<dt>lead</dt>
<dd>integer providing a specific lead value</dd>
<dt>data</dt>
<dd>data.frame object</dd>
<dt>estimation.method</dt>
<dd>method of estimation for calculating standard errors.</dd></dl>

Arguments

getWits
returns a vector of Wits, as defined in the paper (equation 25 or equation 23). They should be in the same order as the data frame containing the original problem data. The pts, pcs, and getWits functions act for a specific lead. So, for instance if our lead window is 0,1,2,3,4, these function must be called for each of those -- so for 0, then for 1, etc. — getWits

<dl>

<dt>matched_sets</dt>
<dd>matched.set object</dd>


<dt>lead</dt>
<dd>integer providing a specific lead value</dd>


<dt>data</dt>
<dd>data.frame object</dd>


<dt>estimation.method</dt>
<dd>method of estimation for calculating standard errors.</dd>

</dl>

getWits
returns a vector of Wits, as defined in the paper (equation 25 or equation 23). They should be in the same order as the data frame containing the original problem data. The pts, pcs, and getWits functions act for a specific lead. So, for instance if our lead window is 0,1,2,3,4, these function must be called for each of those -- so for 0, then for 1, etc.

Description

Usage

Value

Arguments