NEWS.md
In natstrat: Obtain Unweighted Natural Strata that Balance Many Covariates

natstrat 2.0.0 (2021-10-12)

This version adds several new functionalities: * Multiple treatment or control groups * Multiple separate comparisons, using various subsets of the treatment and control groups, for which units are chosen in order to balance covariate distributions for all comparisons simultaneously

Several changes to the interface have been made:

z should generally be a factor instead of a vector as before
treated and control specifications, if needed, should each be a level of z
many arguments can be specified for each of the treatment levels
- q_s, max_entry_s can have a row per treatment level
- ratio, max_ratio can have an entry per treatment level
inputs for the supplemental comparison have been added across the functions: q_star_s, ratio_star, treated_star, weight_star

There are several changes to the outputs:

optimize_controls now has only one version of eps, objective, objective_wo_importances instead of a raw and regular version. The version now reported is the raw version, not corrected for missingness. If you would like corrected versions, refer to the standardized differences outputted by check_balance instead
generate_constraints now returns only standardized outputs, not centered. The centering now takes place within optimize_controls instead