The kmte R package includes a variety of policy evaluations tools when the outcome of interest, typically a duration, is subjected to right censoring. The content includes estimators and tests related to average, quantile and distributional treatment effects under different identifying assumptions including unconfoundedness, local treatment effects, and nonlinear difrences-in-differences.
In short, kmte implements all estimators proposed in Sant'Anna (2016a) "Program Evaluation with Right-Censored Data", and all tests proposed in Sant'Anna (2016b), "Nonparametric Tests for Treatment Effect Heterogeneity with Duration Outcomes". Both articles are available at Pedro H.C. Sant'Anna webpage, http://sites.google.com/site/pedrohcsantanna/ .
When the treatment is exogenous, i.e. under the unconfoundedness assumption, one can use the following functions:
kmate - compute the Average Treatment Effect for possibly randomly censored data.
kmqte - compute the Quantile Treatment Effect for possibly randomly censored data.
kmdte - compute the Distributional Treatment Effect for possibly randomly censored data.
Alternatively, when the treatment is endogenous and we have a binary instrument, i.e. under the local treatment effect setup, one can use the following functions:
kmlate - compute the Local Average Treatment Effect for possibly randomly censored data.
kmlqte - compute the Local Quantile Treatment Effect for possibly randomly censored data.
kmldte - compute the Local Distributional Treatment Effect for possibly randomly censored data.
In addition, the kmte package also implements the following nonparametric tests for treatment effect heterogeneity:
Under Unconfoundedness:
zcate - compute different tests for the null hypothesis of Zero Conditional Average Treatment Effetcs.
zcdte - compute different tests for the null hypothesis of Zero Conditional Distributional Treatment Effetcs.
hcate - compute different tests for the null hypothesis of Homogeneous Conditional Average Treatment Effetcs.
Under the Local Treatment Setup:
zclate - compute different tests for the null hypothesis of Zero Conditional Local Average Treatment Effetcs.
zcldte - compute different tests for the null hypothesis of Zero Conditional Local Distributional Treatment Effetcs.
hclate - compute different tests for the null hypothesis of Homogeneous Conditional Local Average Treatment Effetcs.
The module was written by Pedro H.C. Sant'Anna (Vanderbilt University).
A help file with examples will be made available in the near future.
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