Your credit score is calculated from a variety of credit data that can be found in your credit report. This data can be grouped into five general categories as shown below. The percentages in the chart reflect the importance of each category in determining your score based on the general population. The importance of these categories may be somewhat different for specific groups of the population such as: "People who have not been using credit very long."

Number of various types of accounts (credit cards, retail accounts, installment loans, mortgage, consumer finance accounts, etc.)
Please note that:
A score takes into consideration all these categories of information, not just one or two.
No one piece of information or factor alone will determine your score.
The importance of any factor depends on the overall information in your credit report.
Different factors may be more important for different people in determining their credit score. In addition, as the information in your credit report changes, so does the importance of any factor in determining your score. Thus, it's impossible to say exactly how important any single factor is in determining your score - even the levels of importance shown here are for the general population, and will be different for different credit profiles. What's important is the mix of information, which varies from person to person, and for any one person over time.
Your Credit Score only takes into consideration information found in your credit report.
However, lenders may take into consideration additional information such as your income, how long you have worked at your present job and the kind of credit you are requesting.
Your Credit Score is based on both positive and negative information from your credit report.
Late payments will lower your score, but establishing or re-establishing a good track record of making payments on time will raise your score.