Data from Sell Training Data, sourced and dated

1 dataset, put together from the sources' own pages and refreshed on a set cycle; last read 2026-10-08.

How we build each dataset

First comes the question and the list of pages worth reading. Then each page is fetched and the figure is captured in the source's own sentence, linked and dated.

Nothing counts until a reviewer has accepted the sentence, and every rejection is noted with its reason. One figure per source feeds the median, or one for every breakdown a source prices. Silent sources are recorded as such, and later reads reveal what has changed.