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.
Therefore, start by understanding your condition and the medication and dose your doctor has prescribed for you. Using pill identifiers and knowing what medications your doctor has prescribed will prevent you from taking the wrong medication. Pharmacists are no longer the last line of defense against medication errors; consumers are. Find a picture of your pill using the RxList Pill Identifier Tool.