What's the adjective for quantitativists? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs quantify, quantitate, quantize, quantificate and quantise which may be used as adjectives within certain contexts.
quantum
Of a change, sudden or discrete, without intermediate stages.
“The size classification of the businesses continued to be based on some quantitative criterion.”
“The number of vehicles needed to meet the predicted demand for emergent, urgent, and non-urgent transportation can be calculated for each logical service area using a quantitative formula.”
“The difference between God and man must be qualitative, not merely quantitative.”