Beta-Binomial and user research (or Usability Studies)

As part of this article where OnTrack people explain how they desing it's products, i comment the classic way of determine the size of a sample...

But as java programmer and novice in other fields of learning... I'll need review my learning, with the new aproach in qualitative research.

For my futher reading:

• Scaled Rate Optimization for Beta-Binomial Models - Inon Sharony
• Filling Up Your Tank, Or How To Justify User Research Sample Size And Data
• How to Determine the Right Number of Participants for Usability Studies
• Using Beta Binomial Regression for Inventory Forecasting at Stitch Fix 

Sometimes while programing, i feel like this

now, in other fields too, but, from another point of view... #thinkingfastandslow ;)

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