You try to evaluate the performance and measure the ROI (Return on investment) of your e-Commerce website :

• Where do your visitors derive from? Direct access? Search engines? Link from other sites? Sponsor links?
• Which search engines are generating more sales?
• Which search keys are entered most?
• Your site's position in search engines?
• Which browsers are used most?
• Which publicity campaign is the most efficient ?
• Which are your best referrers/partners ?
• Which are the most efficient links to your site? Which are the best sponsor links ?