Hacker News Front Page Trends

For a given search, the y-axis can display the percentage or number of all front page items that match the search term, the cumulative score of matching front page items, or the percentage of total front page score that the matching items represent. The easiest way to explain them is with examples: – titles that include the word “machine” and the word “learning” – titles that include the word “machine” but not the word “learning” – titles that include the phrase “machine learning” or the word “ML” Titles are converted to using PostgreSQL’s built-in text search configuration. Exact match, case insensitive uses a PostgreSQL regular expression to match the contents of each search term within word boundaries: Note that this makes use of a trigram index, as opposed to full text search, which uses a full text GIN index.

Source: toddwschneider.com