olemus
statistikas: usaldusvahemiku mitmemõõtmeline üldistus punktihulgana n-mõõtmelises ruumis; sageli esitatakse hinnangupunkti ümbritseva ellipsoidina
=multi-dimensional generalization of a confidence interval, a set of points in an n-dimensional space

ülevaateid
https://en.wikipedia.org/wiki/Confidence_region
https://stats.stackexchange.com/questions/138603/confidence-interval-and-confidence-region
http://www2.math.uu.se/~thulin/mm/L4.pdf
https://www.hindawi.com/journals/mpe/2016/7946828/