QDiD-deprecated

QDiD

Deprecated. Use <code>qdid</code> instead.
<code>QDiD</code> is a legacy two-period wrapper for the Quantile
Difference-in-Differences estimator. It accepts a formula and explicit
<code>t</code>/<code>tmin1</code> time period arguments. The modern replacement
<code>qdid</code> uses a <code>yname</code>/<code>gname</code>/<code>tname</code>
interface and supports staggered treatment adoption natively.

internal

Provides several methods for computing the Quantile Treatment
Effect (QTE) and Quantile Treatment Effect on the Treated (QTT). The main
cases covered are (i) treatment is randomly assigned, (ii) treatment is as
good as randomly assigned after conditioning on covariates (selection on
observables) using the methods of Firpo (2007)
<doi:10.1111/j.1468-0262.2007.00738.x>, and (iii) identification is based
on a Difference in Differences assumption, with support for several
varieties including Athey and Imbens (2006)
<doi:10.1111/j.1468-0262.2006.00668.x>, Callaway and Li (2019)
<doi:10.3982/QE935>, and Callaway, Li, and Oka (2018)
<doi:10.1016/j.jeconom.2018.06.008>. Version 2.0 adds a unified staggered
treatment adoption API (built on 'ptetools') for all DiD-based estimators,
as well as a new lagged-outcome unconfoundedness estimator ('lou_qtt').

Brantly Callaway

Quantile Treatment Effects

QDiD-deprecated function

<dl><dt>formla</dt>
<dd>formula of the form <code>y ~ treat</code>.</dd>
<dt>xformla</dt>
<dd>optional one-sided covariate formula.</dd>
<dt>t</dt>
<dd>post-treatment period.</dd>
<dt>tmin1</dt>
<dd>pre-treatment period.</dd>
<dt>tname</dt>
<dd>name of the time column.</dd>
<dt>data</dt>
<dd>data.frame.</dd>
<dt>panel</dt>
<dd>logical; whether data are panel.</dd>
<dt>se</dt>
<dd>logical; whether to compute bootstrap SEs.</dd>
<dt>idname</dt>
<dd>name of the unit id column.</dd>
<dt>alp</dt>
<dd>significance level.</dd>
<dt>probs</dt>
<dd>quantile grid.</dd>
<dt>iters</dt>
<dd>bootstrap iterations.</dd>
<dt>retEachIter</dt>
<dd>logical; return per-iteration results.</dd>
<dt>pl</dt>
<dd>logical; parallel bootstrap.</dd>
<dt>cores</dt>
<dd>number of cores.</dd>
<dt>biters</dt>
<dd>alias for <code>iters</code>; takes precedence if supplied.</dd>
<dt>cl</dt>
<dd>alias for <code>cores</code>; takes precedence if supplied.</dd></dl>

Arguments

QDiD — QDiD-deprecated

<dl>

<dt>formla</dt>
<dd>formula of the form <code>y ~ treat</code>.</dd>


<dt>xformla</dt>
<dd>optional one-sided covariate formula.</dd>


<dt>t</dt>
<dd>post-treatment period.</dd>


<dt>tmin1</dt>
<dd>pre-treatment period.</dd>


<dt>tname</dt>
<dd>name of the time column.</dd>


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


<dt>panel</dt>
<dd>logical; whether data are panel.</dd>


<dt>se</dt>
<dd>logical; whether to compute bootstrap SEs.</dd>


<dt>idname</dt>
<dd>name of the unit id column.</dd>


<dt>alp</dt>
<dd>significance level.</dd>


<dt>probs</dt>
<dd>quantile grid.</dd>


<dt>iters</dt>
<dd>bootstrap iterations.</dd>


<dt>retEachIter</dt>
<dd>logical; return per-iteration results.</dd>


<dt>pl</dt>
<dd>logical; parallel bootstrap.</dd>


<dt>cores</dt>
<dd>number of cores.</dd>


<dt>biters</dt>
<dd>alias for <code>iters</code>; takes precedence if supplied.</dd>


<dt>cl</dt>
<dd>alias for <code>cores</code>; takes precedence if supplied.</dd>

</dl>

QDiD-deprecated: QDiD

Description

Usage

Value

Arguments

See Also