Variable is an element in a model. For example, in the model RS&Pt+1 = a + b Tbill t + et, where RS&Pt+1 is the return on the S&P in month t+1 and Tbill is the Tbill return at month t, both RS&P and Tbill are "variables" because they change through time; i. E., they are not constant.
Barry Goldsmith
| APA | Barry Goldsmith. (2010). variable. Retrieved September 20, 2026, from http://smartdefine.org/variable/definitions/1166165 |
| Chicago | Barry Goldsmith. 2010. "variable" http://smartdefine.org/variable/definitions/1166165 (accessed September 20, 2026). |
| Harvard | Barry Goldsmith 2010, variable, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/variable/definitions/1166165>. |
| MLA | Barry Goldsmith. "variable" 21 October 2010. Web. 20 September 2026. <http://smartdefine.org/variable/definitions/1166165> |