Dummy variables, also known as dummy variables, nominal variables or dummy variables, are artificial variables used to reflect qualitative attributes, and are quantitative independent variables, usually with the value of 0 or 1. The introduction of dummy variables can make the linear regression model more complicated, but the description of the problem is more concise, and one equation can achieve the effect of two equations, which is closer to reality.

Discrete mathematics is a mathematical discipline that studies the structure and relationship of discrete quantities and an important branch of modern mathematics. The meaning of discreteness refers to different connecting elements. The structure based on discreteness and the relationship between them are mainly studied, and its objects are generally finite or countable elements.

Extended data virtual value:

When establishing mathematical formulas, it is necessary to introduce various local objects or virtual elements, which can be handled by modules or other scope structures. Integral variable is a common example of virtual elements in mathematics. When the formal integral is given, the convention mark needs to introduce an integral variable with a definite name. This variable is a local variable of integral, and any name of it cannot conflict with other names in the mathematical expression.

Resource Dumb Variable _ Baidu Encyclopedia