Why is viewing going down?

MediumNetflixmonthly trendlagdecompositionfirst-time usersgenerate_series· 60 XP (20 per step)

Mock interview. You're interviewing for a product analyst job on a streaming service. The interviewer says: "Hours watched have been falling since March. The content team is worried the new shows are flopping. What do you think is going on?" You have watch_sessions and users.

Step 1: How big is the drop?

"Show hours watched for each month of 2026, with the percentage change from the month before."

Expected output

  • hours rounded to 1 decimal; pct_change rounded to 1 decimal, empty for January; sorted by month

Example of the shape (made-up values):

month hours pct_change
2026-01-01 400.0
2026-02-01 380.0 -5.0

Hints, the later steps and the answer come with Pro.

Step 1 of 3

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