bstrap_sample performs a single iteration of bootstrapping of a rank
column in a data frame. The rows matching control in the quoted
quo_group_col column are removed. The remaining rows are grouped by
quo_group_col and in each group the rank column is resampled with
replacement and the mean rank of the resampling for each group is returned
bstrap_sample(iteration, quo_score_col, quo_group_col, df, control = "A")integer giving the current bootstrap iteration from the calling function
quoted column name containing the HR scores
quoted group name containing the group name of the observation
input data frame
character naming the control group that will be removed prior to bootstrapping