Changes in version 1.1.0                        

  - Added honest_did function to compute a sensitivity analysis using
    the approach of Rambachan and Roth (2021)

                 Changes in version 1.0.2 (2023-04-07)                  

  - Huge speedup with many fixed effects with the assist from
    @etiennebacher

                 Changes in version 1.0.1 (2023-03-27)                  

  - One line change sped-up big datasets something like 15x facepalm

                 Changes in version 0.7.0 (2022-07-21)                  

  - Add ARMA_64_BIT for larger matricies

                 Changes in version 0.6.0 (2022-04-07)                  

  - Added estimator argument to event_study and added vignette
    discussing the different estimators' assumptions
  - Fixed "seperate" argument typo in plot_event_study, which may break
    some previous code (https://github.com/kylebutts/did2s/pull/15/)

                        Changes in version 0.5.0                        

  - Made code more robust by improving sparse model matrix creation

  - Rewrote covariance matrix creation to be faster and more robust

  - Improved block bootstrapping code using boot::boot

  - Fixed Sun and Abraham bug in event_study, h/t Frederik Noack

                 Changes in version 0.4.0 (2021-09-27)                  

  - Add event_study and plot_event_study functions

  - Seperated did_imputation to new package didimputation

                        Changes in version 0.3.0                        

  - Add did_imputation following Borusyak, Jaravel, and Spiess (2021)

  - Speed up did2s

                        Changes in version 0.2.0                        

  - Use sparse matrices to use much less memory

  - Fix analytic standard errors when using weights

                        Changes in version 0.1.0                        

  - Correct and robust standard errors