nonstatistical

adjective

non·​sta·​tis·​ti·​cal ˌnän-stə-ˈti-sti-kəl 

: not of, relating to, based on, or employing the principles of statistics : not statistical

a nonstatistical analysis

Any sample where the sample items are not selected according to the laws of chance—that is, by probability sampling—is a nonstatistical sample.

—Howard Sibelman

Word History

First Known Use

1881, in the meaning defined above