Consumers trying to determine their risk of becoming an identity theft victim typically are told to check their credit report for signs of unauthorized or suspicious activity. But a new Web-based service aims to give users a view into tricks ID thieves use that credit reports often miss, such as when crooks use only parts of a victim’s identity to fabricate a new one. The new service, www.myidscore.com, is a free offering by ID Analytics, a company that sells anti-fraud software to banks and other creditors. After providing some personal information and answering a handful of questions, visitors to the site are presented with a score from 1 to 999. Unlike credit scores, where a higher score signifies a favorable credit history, with myidscore.com, a higher score means a greater risk of identity theft. Avivah Litan, a fraud analyst with Gartner Inc., said the difference between a credit report and