null value return for selected columns of a DataFrame
Handles null DataFrame values
Steady47
signal score
as of 1d ago
🔗 2
sources · python
⏳ Too early
trajectory — needs a few more snapshots
Why this scored 47
every term, weightedEngagement per hour, normalized against the fastest item on its own source
Whether that velocity is itself speeding up, as a per-hour rate
How many independent communities are talking about the same entity
Decays to zero over 14 days
Subtracted once something is big and old — we rank what's next, not what's peaked
Weights are hand-tuned, not learned — we're calibrating them against realized trends as history accumulates. On a topic's first sighting there's no previous reading to compare against, so acceleration starts from a neutral prior rather than a measurement. Full methodology
Signal history
7-day window (free)Entities
Embed a live signal badge
[](https://www.signalcrest.app/topic/so%3A79989760)
Drop this in a README or blog post — it updates automatically as the score moves.