Does anybody have a good sampling of test data to test calc features? Does anyone want to collaborate on developing such test data?
Data to test what and how? There’s plenty of tests in the git repository under sc/qa/ in various subdirectories. qa - OpenGrok cross reference for /core/sc/qa/
If you have a clone you can find most data files with
find sc/qa/ -name '*.ods' -o -name '*.xls*' -o -name '*.csv'
but without the accompanying tests used during make check that doesn’t help much.
I’m thinking of something that someone new to LO can use to learn with. Something similar to what instructional materials for Excel include with their textbooks.
Talking of manuals, maybe start here to avoid using “answers”, wich didn’t answer your question: