achievable_totals       Achievable total scores of an instrument
classify_severity       Classify total scores into severity bands
get_instrument          Retrieve an instrument definition by id
list_instruments        List registered instruments
mid_estimates           Published anchor-based change statistics ("MID
                        estimates")
missing_rule_none       Declare that no published missing-item rule
                        exists for an instrument
missing_rule_prorate    Declare a published prorated-scoring rule for
                        missing items
register_instrument     Register an instrument definition
responder               Classify responders by an explicitly chosen
                        change threshold
score_instrument        Score an instrument from a data frame of item
                        responses
score_ipss              Score the International Prostate Symptom Score
                        (IPSS)
uro_instrument          Define a scoring instrument
