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Conversion Rates
The "conversion rate" is the percentage of users who complete a desired action, like signing up. If 100 people visit your homepage and 10 sign up, the conversion rate is 10%.
If only 5 of those signups submit a lesson, the "step conversion rate" from signup to lesson submission is 50%, but the "overall conversion rate" from homepage visit to lesson submission is only 5%.
| Step | Users | Overall conversion | Conversion from previous step |
|---|---|---|---|
| Homepage visit | 100 | 100% | - |
| Signup | 10 | 10% | 10% |
| Lesson submission | 5 | 5% | 50% |
Assignment
SnackStack's growth team wants a simple, unordered check of how many users appear in one funnel step compared to another.
Complete the calculate_conversion_rate function. It accepts an events DataFrame (user_id and step columns) plus a from_step and a to_step, and returns the conversion rate between them as a float.