Return on Equity (ROE) is defined as the ratio of net income to equity. It measures the return on funds invested by shareholders, which is crucial for evaluating the effectiveness of shareholder investment and comparing companies within the same sector. However, a high ROE combined with a low ROA may indicate excessive reliance on debt rather than genuine operational efficiency.

The interest coverage ratio, which divides the gross operating surplus by financial charges, measures the company's ability to meet its financial obligations. A ratio above 3 is generally required by banks to ensure that the company can cover its interest payments without difficulty.

The financial autonomy ratio, which is the ratio of equity to total assets, measures independence from creditors. A level of at least 20% is generally considered the minimum threshold for financial soundness, indicating a healthy financial structure and the ability to meet long-term obligations.

The current ratio, which is the ratio of current assets to current liabilities, should ideally be between 1.5 and 2. This ratio indicates that the company has sufficient short-term resources to cover its debts payable within the year without difficulty.

Financial ratios are classified into categories according to their purpose. Profitability ratios measure financial performance, liquidity ratios assess the ability to pay short-term debts, solvency ratios analyze long-term financial structure, and activity ratios measure operational efficiency.

The Quick Ratio, or acid-test ratio, is defined as the ratio of current assets minus inventories to current liabilities. It assesses the company's ability to meet its short-term debts without relying on the sale of inventories, which are less liquid.

Return on Assets (ROA) measures the overall efficiency of resource utilization. While a ROA above 5% is generally considered satisfactory, there are significant sector-specific variations. For example, capital-intensive industries may have different profitability thresholds due to their specific cost and investment structures.

The inventory turnover period measures the average storage duration. A period of less than 20 days indicates that the company sells its inventory quickly, which is a sign of excellent logistics management and reduces the risks of obsolescence and excessive capital tie-up.