The crime is murder in these novels, and the plots include accessories such as floor plans, maps, and railway timetables. The appeal of Golden Age fiction is the challenge of the intellectual game.
exogenous variables. (mathematics). In a mathematical model, the independent variables, which are predetermined and given outside the model. 1  Facebook. 2  Twitter.
An independent variable is also known as a predictor variable, regressor, controlled variable, manipulated variable, explanatory variable,  exposure variable  (see reliability theory),  risk factor  (see medical statistics),  feature  (in machine learning and pattern recognition) or an input variable..