That's all this is really. The left Y axis applies to the sets that involve an average score, the right Y axis applies to pickup ratio only.
That said, what is a pickup ratio? Some sort of measure of extra votes over time?
That said, what is a pickup ratio? Some sort of measure of extra votes over time?
Pickup ratio > 1 means that the "newest" page has couple very interesting stories that are also seen on the "news" page.
Pickup ratio > 2 means that there is some sort of hysteria on HN about some particular topic ...