Financial Ratio Features

Compute financial ratio features from per-period statement line items.

data maps IncomeStatement / BalanceSheet / CashFlowStatement field names (revenue, net_income, total_assets, cash_from_operations, ...) to per-period values, oldest first; all series must have the same length. Returns the ratios for every period (the prior period's balance sheet feeds the turnover ratios) and for the latest one. Ratios whose inputs were not supplied are omitted.