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Three common methods of representing variables
Three commonly used methods to represent variables: list method, analytical method and image method.

1, tabular method

Through the list lattice, we can get the relationship information between variables, further predict their changing trends and make scientific judgments; Generally speaking, the dependent variable shows a certain law with the change of the independent variable, and the conclusion can be predicted according to this law.

2. Analytical formula method

Analytic formula is another way to express the relationship between variables, which can accurately reflect the numerical correspondence between dependent variables and independent variables, that is, when each independent variable has a certain value, the dependent variable also has a certain value corresponding to it.

3. Mirror image method

Images are another way to express the relationship between variables, and images can directly reflect the changing trend of dependent variables with independent variables. It usually uses points on the horizontal axis (called the horizontal axis) to represent independent variables, and points on the vertical axis (called the vertical axis) to represent dependent variables.

Related introduction of variables

I introduction of variables

In elementary mathematics, variables are alphabetic characters representing numbers, which are arbitrary and unknown. Taking variables as explicit numbers, algebraic calculation can solve many problems in one calculation.

The concept of variables is also the basis of calculus. The general function y = f(x) involves two variables y and x, which represent the value and parameters of the function respectively.

In advanced mathematics, variables are symbols representing mathematical objects, which can be numbers, vectors, matrices or even functions. In this case, the original attribute of the variable will disappear.

Second, statistical variables

Statistical absolute quantity indicators can be divided into discrete variables and continuous variables according to continuity.

1. Discrete variable

Discrete variables can also be called discrete indicators, which can only be expressed as a whole. Can be obtained by counting, the smallest unit can only be an integer, can only be divided by a limited number of times.

2. Continuous variables

A continuous variable can also be called a continuous index, which can be a decimal in the case of the smallest unit and can be divided infinitely.