rddensityUnique

<p>Numeric vector, already sorted in ascending order.</p>

<p>Find unique elements and their frequencies in a numeric vector. This function
  has a similar performance as the built-in R function <code>unique</code>.</p>

internal

Density discontinuity testing (a.k.a. manipulation testing) is commonly employed in regression discontinuity designs and other program evaluation settings to detect perfect self-selection (manipulation) around a cutoff where treatment/policy assignment changes. This package implements manipulation testing procedures using the local polynomial density estimators: rddensity() to construct test statistics and p-values given a prespecified cutoff, rdbwdensity() to perform data-driven bandwidth selection, and rdplotdensity() to construct density plots.

Xinwei Ma

rddensityUnique: Internal function.

Description

Usage

Arguments

Value