Update 01_stata.md

docs/01_stata.md

@@ -13,7 +13,7 @@ Packages are sorted in alphabetical order by name. Some package paths have been
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 | `bacondecomp` | `ssc install bacondecomp, replace` <br> or older version: <br> `net install ddtiming, from (https://tgoldring.com/code/)`  |   | [Andrew Goodman-Bacon](http://goodman-bacon.com/) [<img width="12px" src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/twitter.svg" />](https://twitter.com/agoodmanbacon) <br> [Thomas Goldring](https://tgoldring.com/) <br> Austin Nichols [<img width="12px" src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/twitter.svg" />](https://twitter.com/AustnNchols) |   [Andrew Goodman-Bacon](http://goodman-bacon.com/) [<img width="12px" src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/twitter.svg" />](https://twitter.com/agoodmanbacon) (2021). [Difference-in-differences with variation in treatment timing](https://www.sciencedirect.com/science/article/abs/pii/S0304407621001445). Journal of Econometrics |
 | `csdid`   |  `ssc install csdid, replace`    | [Link](https://friosavila.github.io/playingwithstata/main_csdid.html)   | [Fernando Rios-Avila](https://friosavila.github.io/playingwithstata/index.html) [<img width="12px" src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/twitter.svg" />](https://twitter.com/friosavila) <br> [Pedro H.C. Sant'Anna](https://pedrohcgs.github.io/) [<img width="12px" src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/twitter.svg" />](https://twitter.com/pedrohcgs)  <br>  [Brantly Callaway](https://bcallaway11.github.io/)   |  [Brantly Callaway](https://bcallaway11.github.io/), [Pedro H.C. Sant'Anna](https://pedrohcgs.github.io/) [<img width="12px" src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/twitter.svg" />](https://twitter.com/pedrohcgs) (2020). [Difference-in-Differences with multiple time periods](https://www.sciencedirect.com/science/article/abs/pii/S0304407620303948), Journal of Econometrics.  |
-| `csdid2`   |  [Instructions](https://github.com/friosavila/stpackages/tree/main/csdid2)    | [Link](https://github.com/friosavila/stpackages/tree/main/csdid2)   | [Fernando Rios-Avila](https://friosavila.github.io/playingwithstata/index.html) [<img width="12px" src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/twitter.svg" />](https://twitter.com/friosavila) <br> [Pedro H.C. Sant'Anna](https://pedrohcgs.github.io/) [<img width="12px" src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/twitter.svg" />](https://twitter.com/pedrohcgs)  <br>  [Brantly Callaway](https://bcallaway11.github.io/)   |  [Brantly Callaway](https://bcallaway11.github.io/), [Pedro H.C. Sant'Anna](https://pedrohcgs.github.io/) [<img width="12px" src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/twitter.svg" />](https://twitter.com/pedrohcgs) (2020). [Difference-in-Differences with multiple time periods](https://www.sciencedirect.com/science/article/abs/pii/S0304407620303948), Journal of Econometrics.  |
+| `csdid2`   |  [Instructions](https://github.com/friosavila/stpackages/tree/main/csdid2)    | [Link](https://github.com/friosavila/stpackages/tree/main/csdid2)   | [Fernando Rios-Avila](https://friosavila.github.io/playingwithstata/index.html) [<img width="12px" src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/twitter.svg" />](https://twitter.com/friosavila)   |  [Brantly Callaway](https://bcallaway11.github.io/), [Pedro H.C. Sant'Anna](https://pedrohcgs.github.io/) [<img width="12px" src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/twitter.svg" />](https://twitter.com/pedrohcgs) (2020). [Difference-in-Differences with multiple time periods](https://www.sciencedirect.com/science/article/abs/pii/S0304407620303948), Journal of Econometrics.  |
 | `did2s` |  `ssc install did2s, replace`     | [Link](https://github.com/kylebutts/did2s_stata)   | [Kyle Butts](https://kylebutts.com/) [<img width="12px" src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/twitter.svg" />](https://twitter.com/kylefbutts) | [John Gardner](https://jrgcmu.github.io/) (2021). [Two-stage differences in differences](https://jrgcmu.github.io/2sdd_current.pdf). |
 | `did_multiplegt` | `ssc install did_multiplegt, replace` |    |   [Clément de Chaisemartin](https://sites.google.com/site/clementdechaisemartin/) [<img width="12px" src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/twitter.svg" />](https://twitter.com/CdeChaisemartin) <br> [Xavier D'Haultfoeuille](https://faculty.crest.fr/xdhaultfoeuille/)  | Clément de Chaisemartin, Xavier D'Haultfoeuille (2020). [Two-Way Fixed Effects Estimators with Heterogeneous Treatment Effects](https://www.aeaweb.org/articles?id=10.1257/aer.20181169). American Economic Review. <br> Clément de Chaisemartin, Xavier D'Haultfoeuille (2021). [Two-way fixed effects regressions with several treatments](https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3751060).  <br>  Clément de Chaisemartin, Xavier D'Haultfoeuille (2021). [Difference-in-Differences Estimators of Inter-temporal Treatment Effects](https://arxiv.org/abs/2007.04267). |
 | `did_imputation` | `ssc install did_imputation, replace` | [Link](https://github.com/borusyak/did_imputation)   |  [Kirill Borusyak](https://sites.google.com/view/borusyak/home) [<img width="12px" src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/twitter.svg" />](https://twitter.com/borusyak) <br> [Xavier Jaravel](https://www.lse.ac.uk/economics/people/faculty/xavier-jaravel) [<img width="12px" src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/twitter.svg" />](https://twitter.com/XJaravel) <br> [Jann Spiess](https://www.gsb.stanford.edu/faculty-research/faculty/jann-spiess) [<img width="12px" src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/twitter.svg" />](https://twitter.com/jannspiess)  |   [Kirill Borusyak](https://sites.google.com/view/borusyak/home) [<img width="12px" src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/twitter.svg" />](https://twitter.com/borusyak), [Xavier Jaravel](https://www.lse.ac.uk/economics/people/faculty/xavier-jaravel) [<img width="12px" src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/twitter.svg" />](https://twitter.com/XJaravel), [Jann Spiess](https://www.gsb.stanford.edu/faculty-research/faculty/jann-spiess) [<img width="12px" src="https://cdn.jsdelivr.net/npm/simple-icons@v5/icons/twitter.svg" />](https://twitter.com/jannspiess) (2021). [Revisiting Event Study Designs: Robust and Efficient Estimation](https://www.google.com/url?q=https%3A%2F%2Fwww.dropbox.com%2Fs%2Fy92mmyndlbkufo1%2FDraft_RobustAndEfficient.pdf%3Fraw%3D1&sa=D&sntz=1&usg=AFQjCNGGDRt4xPz3hCXhTWxchHJWh-1m_Q). |