Time‑Series and Mixed Models
When randomization is tough, interrupted time‑series can reveal shifts after introducing specific exercises, especially if you have enough historical data. Mixed models help account for writer, product, and channel differences without flattening nuance. Track level changes and slopes. Pair with campaign calendars to control for launches. Even modest, persistent improvements in approval velocity or headline lift compound into substantial impact across quarters, making the case for continued investment in focused, adaptive learning.