Growth Hacking Metrics:
Qualitative metrics are unstructured, anecdotal, revealing, and hard to aggregate; quantitative metrics involve numbers and statistics and provide hard numbers but less insight.
Vanity versus actionable metrics. Alistair Croll in his Book Lean Analytics: Use Data to Build a Better
Startup Faster further writes: Instincts are Experiments, Data is proof!
#1 Growth Hacking Lab for Startups: