WordNet records no synonym and no antonym for multiple correlation coefficient. It is the only member of its synset, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
an estimate of the combined influence of two or more variables on the observed (dependent) variable
Synonyms, antonyms and the broader and narrower relations for multiple correlation coefficient come from Princeton University’s WordNet. Full sources and licences.