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.
Doxepin is a prescription drug. It comes as an oral tablet, oral capsule, oral solution, and topical cream. Doxepin oral capsule doesnât have a brand-name version. Itâs only available as a generic drug. Generic drugs usually cost less than brand-name drugs. Why it's used. Doxepin oral capsule is used to treat mood disorders, such as depression and anxiety. How it works. Doxepin belongs to a class of drugs called tricyclic antidepressants.