Authors:
Anna-Lena Woelwer [aut, cph]
,
Jan Pablo Burgard [aut, cph]
,
Joshua Kunst [aut, cph]
,
Mauricio Vargas [aut, cre, cph]
,
Romain Francois [ctb] (adapted parts of the code to use dplyr 0.8.0)
,
Lionel Henry [ctb] (simplified parts of the code)
,
Sarah Johnson [ctb] (improved the double demeaning function)
,
Hrisyana Doytchinova [rev] (sent us different suggestions and bug
reports)