GrowSignal Video

How our metrics are calculated (English)

View counts, like counts and concurrent viewers are public data from the YouTube Data API. Momentum (⚡) and the stage labels are GrowSignal's own estimates, calculated only from the statistics of the same video. They are not YouTube's numbers, and they are labelled as our estimates wherever they appear.

• View growth: increase in the view count divided by the hours between two observations (we record public counts every 3 hours; every 5 minutes for live streams).
• Like growth: increase in the like count divided by the hours between two observations.
• Momentum (⚡): view growth + ρ × like growth, averaged over the last 24 hours. ρ is the video's own ratio of view growth to like growth over its observation period (views per like).
• Momentum change: the 24-hour average momentum now compared with the same 24-hour average 12 hours earlier (for live streams: the last 30 minutes compared with the 30 minutes before).
• Peak ratio: current momentum divided by the highest momentum observed for the same video.
• Stage (🌱 Seed / 🌿 Growing / 🌸 Blooming / 🌳 Steady / 🍃 Pausing / 🍂 Faded): fixed thresholds on the peak ratio and the momentum change of the same video.
• Order of lists: by momentum change (videos with very low momentum are placed after).

Where they are shown: on the home page and lists (stage label and momentum next to the video), and on each video page (the stage, momentum and their history, next to the view and like counts from YouTube, with a note that they are our own estimates). Videos are played only in the official embedded YouTube player with full controls.