Retention curve by signup week
“build retention curves by signup week: share of users active in each week after signup”
Build retention curves by signup week from Mixpanel weekly active users by signup cohort and Mixpanel signups by week: share of users active in each week after signup.
What the agent built
2 steps, each one an ordinary Mammoth step you can open and change.
- FileMixpanel weekly active users by signup cohortCSV export · 36 rows
- FileMixpanel signups by weekCSV export · 6 rows
- JoinBring in cohort sizes36 of 36 paired
- StepCalculate active shareStep 2
- ResultWeekly Cohort Retention36 rows
- ScheduleRuns when you sayProposed
Checked on the sample files: every step ran, 36 rows came out, and the join paired 36 of 36 rows.
- Download Mixpanel weekly active users by signup cohort sample (36 rows)Mixpanel: Reports > Retention > Export CSV
- Download Mixpanel signups by week sample (6 rows)Mixpanel: Reports > Trends > Export CSV
What you get back
The result of that run, the rows to look at first.
| Signup Week | Week After Signup | Share Active | Active Users | New Users |
|---|---|---|---|---|
| 2026-10-05 | 0 | 65.3% | 47 | 72 |
| 2026-10-05 | 1 | 54.2% | 39 | 72 |
| 2026-10-05 | 2 | 43.1% | 31 | 72 |
| 2026-10-05 | 3 | 38.9% | 28 | 72 |
| 2026-10-05 | 4 | 30.6% | 22 | 72 |
| 2026-10-05 | 5 | 22.2% | 16 | 72 |
| 2026-10-12 | 0 | 65.5% | 38 | 58 |
| 2026-10-12 | 1 | 51.7% | 30 | 58 |
| 2026-10-12 | 2 | 43.1% | 25 | 58 |
| 2026-10-12 | 3 | 34.5% | 20 | 58 |
| 2026-10-12 | 4 | 27.6% | 16 | 58 |
| 2026-10-12 | 5 | 20.7% | 12 | 58 |
How do you build a retention curve by signup week?
Export weekly active users by signup cohort and signups by week from Mixpanel. Load both files, then bring in cohort sizes and calculate the active share for each week after signup. The result is a weekly cohort retention curve.
How it works
How to use the Weekly Cohort Retention workflow
- 1Get early accessWe invite people in small batches, job by job. You'll land on this workflow, already built and checked on the sample files.
- 2Swap in your exportsUpload your own files as they come out of your tools. The agent checks the workflow on your rows.
- 3Change it in words, then turn it onSay what to change and see the new result before anything saves. Then choose when it runs.
Weekly Cohort Retention: questions
What export should you use?
What happens to rows that do not match?
How do you change the rules?
Get early access to this workflow
It will open already built and checked on the sample files. Swap in your own exports and see your result.
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