There are many kinds of relative numbers, which can be divided into two types according to their manifestations: one is the nominal number, that is, the relative number calculated by comparing two absolute numbers with different properties and connections or average index, usually the nominal number, with multiple units of measurement.

The other is the unknown, which can be expressed by multiples, fractions, coefficients, percentages, thousandths, etc. According to different conditions such as birth rate and death rate.

Extended data:

Nominal number is mainly used to express the relative teaching of index value in relative index; Relative number can be divided into five types according to the nature and function of the indicators compared with each other: dynamic relative number, structural relative number, comparative relative number, intensity relative number and planned completion relative number.

There are two forms of relative indicators: nominal and unknown, which are composed of static relative indicators and dynamic relative indicators. Among them, static relative indicators include intensity relative indicators (an indicator/a related but uncertain indicator, such as population density = population/geographical area), which are both famous and unknown.

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