What this is
It's hard to spot a gap in your reading when you've never heard of the subfield. This map is built from the papers themselves, not from anyone's list. Load your reference library, and the subfields you've never read show up as gaps.
Your reading
The map
Filled, with a count: you have read it Hollow, dashed: a gap
The subfields
How it's made
Every article from eight general biostatistics journals, from OpenAlex. Papers are grouped by the words in their titles and abstracts and by the papers they cite. Each group is named by the words that set it apart, so the names are rough.
A paper in your file is matched by its DOI when it's on the map. Otherwise it's placed by the papers it cites, looked up on OpenAlex, and failing that by its title words. Both are rough. Tested on a fifth of the map's own papers, held back while the rest built the subfields, citations picked the paper's own subfield two times in three, and title words about half the time.
The code and method are on GitHub.