{"id":"derived_ratios","columns":[{"name":"metric_id","type":["string","null"]},{"name":"metric","type":["string","null"]},{"name":"period","type":["string","null"]},{"name":"period_start","type":["integer","null"]},{"name":"period_kind","type":["string","null"]},{"name":"entity","type":["string","null"]},{"name":"category","type":["string","null"]},{"name":"source_family","type":["string","null"]},{"name":"value","type":["number","null"]},{"name":"unit","type":["string","null"]},{"name":"scenario","type":["string","null"]},{"name":"numerator_metric","type":["string","null"]},{"name":"denominator_metric","type":["string","null"]},{"name":"basis","type":["string","null"]},{"name":"source_url","type":["string","null"]},{"name":"notes","type":["string","null"]}],"empty_values":"CSV empty fields and JSON null mean unavailable; an explicit zero is numeric zero.","source_reference":"Source URL plus page, row, column, or line fields where supplied. Financial columns keep their own budget stages."}