xtevent 2.2.0

Zip from 6051123

xtevent 2.2.0 adds new features:

• Add cohort and control_cohort to obtain estimates using Sun and Abraham's (2021) method.
• Add repeatedcs option and get_unit_time_effects command to estimate event-studies in repeated cross-section settings.
• Add noestimate option to savek() to generate event-time dummies without estimating the regression model.
• Enable clustered and robust standard errors for IV estimation without reghdfe.
• Fixed bugs present in version 2.1.1.

What's Changed

• Generate event-time dummies without estimation by @jorpppp in #94
• PR for #98: Fix xtevent help file abbreviation by @rayhuang11 in #99
• PR for #96: Typo in xteventplot help file by @rayhuang11 in #97
• #105 fix some appearance options not working by @jorpppp in #106
• PR for #104: enable options cluster and robust by @Constantino-Carreto-Romero in #107
• PR for #111: drop of collinear variables by @Constantino-Carreto-Romero in #112
• PR for #108: warning if robust se by @Constantino-Carreto-Romero in #117
• PR for #113: examples without collinearity by @Constantino-Carreto-Romero in #115
• PR for #116: wording of warning by @Constantino-Carreto-Romero in #118
• PR for #103: emphasize impute option by @Constantino-Carreto-Romero in #121
• PR for #114: proxyiv doesnt allow varnames by @Constantino-Carreto-Romero in #122
• PR for #35: implement estimation robust treatment heterogeneity by @Constantino-Carreto-Romero in #124
• Issue 59 allow for data structures that cannot be xtseted by @jorpppp in #127
• PR for #128: imputation note's link is not updated by @Constantino-Carreto-Romero in #129
• #130 Fix typo by @jorpppp in #133
• #132 Fix bug in overid testing when overidpost was active by @jorpppp in #134
• 131 check that the smoothest paths wald critical value is correct by @jorpppp in #135
• #137 Fix bug in static estimation without imputation by @jorpppp in #138
• Issue126 excluding units but eventtime is defined by @jorpppp in #139
• 136 check smoothest line solution by @jorpppp in #142
• PR for Issue120 integrate impute documentation by @jorpppp in #144
• PR for 109 xtevent 220 by @jorpppp in #146

Full Changelog: v2.1.1...v2.2.0