Man pages matching name statistics::descriptive::smoother in section 3pm:

Statistics::Descriptive::Smoother.3pm.en	debian 10 / libstatistics-descriptive-perl
Statistics::Descriptive::Smoother.3pm.en	debian 11 / libstatistics-descriptive-perl
Statistics::Descriptive::Smoother.3pm.en	debian 12 / libstatistics-descriptive-perl