A regression with two or more predictor variables is called a multiple. regression. (When we need to note the difference, a regression on a single predic-. tor is called a simple regression.) Weâd never try to find a regression by hand, and. even calculators arenât really up to the task.
Different jurisdictions have different definitions of what constitutes a prescription drug. Rx is often used as a short form for prescription drug in North America-a contraction of the Latin word  recipe  (an imperative form of recipere) meaning take.
Hydrocodone prescription question. I saw my pain doctor on May 10th, and at that time, he gave me two prescriptions for hydrocodone (BT med). They both had the same number of pills and strength, but one RX had one refill, and the other did not. The two RXs are meant to be a 3-month supply.