A group of quantitative UX researchers at Google, like to think of large-scale data analysis as just another UX research method. They have developed a couple of useful methods to help choose and define appropriate metrics that reflect:

• The quality of user experience (the HEART framework)
• The goals of your product or project (the Goals-Signals-Metrics process)

To learn and further practice the method :

• What is Heart ?
• UX - Metrics, Explained