create_method           Create a cross-fitting method specification
create_nuisance         Create a nuisance specification
crossfit                Cross-fitting for a single method
crossfit-package        crossfit: Cross-Fitting Engine for Double /
                        Debiased Machine Learning
crossfit_multi          Cross-fitting for multiple methods
mean_estimate           Aggregators for scalar estimates
mean_predictor          Aggregators for cross-fitted predictors
