```xml <result> <column_name>cost_usd</column_name> <family>additive</family> <subtype>ordinal_additive</subtype> <confidence>0.85</confidence> <requires_user_confirmation>false</requires_user_confirmation> <sum_meaningful>true</sum_meaningful> <signed>false</signed> <reducers> <primary_reducer>sum</primary_reducer> <valid_reducers>sum, mean, min, max, median, count, distribution</valid_reducers> <excluded_reducers>product (not a ratio), geomean (not a ratio)</excluded_reducers> <average_semantics>arithmetic_mean</average_semantics> </reducers> <inner_outer_measure> <inner_measure_reducer>sum</inner_measure_reducer> <outer_measure_reducer>sum</outer_measure_reducer> </inner_outer_measure> <multiplicative_partner_derivable>true</multiplicative_partner_derivable> <reasoning> Table is PATH with sequence axis, so multiplicative is plausible. However, column name "cost_usd" is a strong additive signal (currency unit, cost token). Center-of-mass is far from 1.0 (mean=0.065, median=0.037), ruling out ratio_multiplicative. Contains zeros (7.5%), which contradicts multiplicative. The column represents an instantaneous cost at each sequence step - a physical quantity on a PATH table. Classified as ordinal_additive rather than real_additive because summing instantaneous costs across timestamps is ordinally meaningful (requires normalization by time step), while sum across entities at fixed time is the natural aggregation. </reasoning> <table_type_conflict>false</table_type_conflict> </result> ```