While this would be great feature at some point, a current work-around is to export data to a spreadsheet and use statistical analysis there.

Correlate goals to discover patterns and learn how to set yourself up for success. Do you only smoke when you drink?

a first step could be showing multiple logs on one page, a second step combining them in the same diagram. in case there is a correlation, then it would be neat being able to define custom tracking dimensions (e.g. a combined value which gets aggregated out of the logs from multiple hard facts).

The ability to combine behaviors. For example I want to track the amount of hours I'm awake to see what level is optimal for me. So being able to combine my wake time and bedtime automatically into a metric would be great. There are of course, many other applications to having formulas.

I came to this page to make this comment, and am glad to see someone else already thought the same thing.

I wish I could see the relationship between my weight and the particular eating and drinking habits I'm tracking. Graphing 2 habits on 1 chart would help me see if and how much certain habits are related.

Great idea! I track sleep, exercise, calories, and even water intake and I'd love to see the trends of each combined onto one chart.

For example, I'd like a visual representation of how my loss of pounds relates to my loss of body fat.