Check out the ecommerce engagement metrics I track in my Growth Hacking Your Ecommerce Conversion Funnel blog post on the Symphony Commerce blog.
"Anyone who runs a business knows that there are two key drivers for additional revenue: either increase conversions or increase customer engagement. Put another way, sell more to your existing customers and/or sell to new customers.
If your marketing efforts are bringing sufficient traffic to your web store, then conversion rate optimization is the key to unlock additional revenue. Are site navigation, searching, and filtering features helping customers find the right product? Are cross sells effective at showcasing more products to customers? Is your checkout flow encouraging or discouraging purchases?..."