* initial commit

* reproduce did2s.r results

* add twfe estimator

* create treatment var internally

* some defensive input checks

* acknowledge kyle as copyright holder

* create experimental folder

* update docs

* update version

* add did2s function

* get event_study() did2s to work again

* delete did2s function

* add basic tests

* patch version

* delete pyaches

* update news

* update starting message

* update readme

* update pyproject.toml

* ci tests on mac as fixest already compiled

* test on windows

* back to testing on linux

* first install python, then R deps

* fix yaml syntax

* yaml is too hard

* some work towards a more flexible API

* get did2s function prototype to run

* event_study() and did2s() both run through

* add examples to did2s() and event_study()

* more tests for did2s

* pass tests

* two reference levels

* fix small bug re _drop_ref

* get did2s() to run

* fix did2s vcov bug

* add tests

* update did example

* further updates

* update i-tests

* bump version and update readme

* readme tweaks

* update news

* update readme

* add black action

* run black

* revert notebook

* check for did2s if treatment is boolean

* update docs

* ci only when push to master

* bump version

* small fixes

* formatting

* first step to prettier etable

* add tabulate dependency, fix etable fixef bug

* fix bug with no fixed effects

* fix no model has fixef exception

* bump poetry version

* fix hline placement bug

* formatting

* make plot nicer

* add vcov info

* reformat

* reformat

* attempt to fix #211

* cleanup

* clarification

* fix i() bug for i(var), not for i(var1, var2)

* add drop_intercept argument to feols, fepois

* fix error with did2s inference

* add error when 0 or -1 in first stage

* fix tests, output warning for i(var1, var2) syntax

* format code

* update figure + fix small bug

* no 0 in second stage did test

* bump version

* deprecate i(var1, var2) syntax, update news

* format

* bring back i(var1, var2)

* format

* update docs

* add _depvar attribute to Feols object

* use _depvar attribute

* move separation checks out of Fepois to fix #138

* revert changes to performance method

* temporarily do not report r squared metrics

* fix separation bug  #138

* formatting

* update docs