In order to make decision whether or not to buy a specific company stock, it is important to gauge its financial health and stability. Above list will help an investor assess a company. Most of the information to calculate these ratios is available in firm's balance sheet, usually available on company's website, under Regulatory Reporting or else Investor Interest sections.
The checklist is applicable to both public sector and private sector organisations. Brief explanation on each of these ratios can be sourced from: Financial Ratios.
There are different ways to assess investment worthy stocks, this can be considered as one way to look into a firm.