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# CITATION.cff file created with {cffr} R package
# See also: https://docs.ropensci.org/cffr/
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cff-version: 1.2.0
message: 'To cite package "phdid" in publications use:'
type: software
license: MIT
title: 'phdid: Partial Homogeneity in Staggered Difference-in-Differences'
version: 0.1.0
identifiers:
- type: doi
  value: 10.32614/CRAN.package.phdid
abstract: 'In staggered difference-in-differences designs the treatment effect is
  a vector of cohort-time effects rather than a single number. Estimating each separately
  is unbiased but imprecise when some are equal, while pooling them all is precise
  but biased under genuine heterogeneity. This package treats the choice as a partition-selection
  problem on the cohort-time cells and provides two estimators for it: a Dirichlet
  process mixture fitted by a collapsed Gibbs sampler, whose posterior marginalises
  over the unknown partition and reports co-clustering probabilities, and an ''L0''-penalised
  estimator that returns a single partition and arises as the fixed-variance maximum
  a posteriori solution of the same model. Also provides tests for whether the cohort-time
  effects carry recoverable heterogeneity at all, sampler diagnostics including exact
  enumeration of the partition posterior for small designs, regularisation paths for
  both estimators, and a calibrated data-generating process. All estimators accept
  a vector of first-stage cohort-time effects with their joint covariance, so any
  heterogeneity-robust first-stage estimator may be used. Methods are described in
  Arora and Wagle (2026) <https://doi.org/10.2139/ssrn.7207083>.'
authors:
- family-names: Wagle
  given-names: Rohan
  email: rohan.wagle_ug2023@ashoka.edu.in
- family-names: Arora
  given-names: Parush
  email: parush.arora@ashoka.edu.in
preferred-citation:
  type: report
  title: A Bayesian Approach to Partial Homogeneity in Staggered Difference-in-Difference
  authors:
  - family-names: Arora
    given-names: Parush
    email: parush.arora@ashoka.edu.in
  - family-names: Wagle
    given-names: Rohan
    email: rohan.wagle_ug2023@ashoka.edu.in
  year: '2026'
  month: '7'
  institution:
    name: Ashoka University
  issue: '166'
  url: https://www.ashoka.edu.in/research/a-bayesian-approach-to-partial-homogeneity-in-staggered-difference-in-difference/
repository: https://ronwag2005.r-universe.dev
repository-code: https://github.com/ronwag2005/phdid
commit: 3f3733927f4eaa6a6d408e6f627f368e7136594b
url: https://github.com/ronwag2005/phdid
date-released: '2026-09-17'
contact:
- family-names: Wagle
  given-names: Rohan
  email: rohan.wagle_ug2023@ashoka.edu.in
references:
- type: report
  title: A Bayesian Approach to Partial Homogeneity in Staggered Difference-in-Difference
  authors:
  - family-names: Arora
    given-names: Parush
  - family-names: Wagle
    given-names: Rohan
  year: '2026'
  month: '3'
  institution:
    name: Social Science Research Network
  issue: '7207083'
  doi: 10.2139/ssrn.7207083
  url: https://ssrn.com/abstract=7207083
- type: manual
  title: 'phdid: Partial Homogeneity in Staggered Difference-in-Differences'
  authors:
  - family-names: Wagle
    given-names: Rohan
  - family-names: Arora
    given-names: Parush
  year: '2026'
  notes: R package version 0.1.0
  url: https://github.com/ronwag2005/phdid