What is the primary issue in statistical grouping?

The primary issues in statistical grouping are: determining the purpose of the survey and selecting the grouping mark. Grouping flags are the criteria or basis for dividing a homogeneous population into different groups; the selection of grouping flags is the key to statistical grouping. Once the grouping mark is selected, it will inevitably highlight the qualitative difference of the overall group under this mark, and other differences will be invisible.

Statistical grouping is a statistical method that divides the statistical population into several components according to certain signs according to the needs of statistical research. These components of the population are called "groups", which are small populations within the large population.

Through statistical grouping, the properties of the grouping flags of each unit in the same group are the same, and the properties of different groups are different. The grouping of statistical populations is determined by the "difference" characteristics of each population unit in the statistical population.

The various units in the statistical population, on the one hand, have the same properties in one or several signs and can be combined in the population of the same nature; on the other hand, they have each other in other signs Different properties can be divided into several components with different properties.

Statistical Grouping System

The overall series of interrelated and mutually complementary groups formed after statistical grouping is called the grouping system. There are two types of grouping systems: parallel grouping system and composite grouping system. The parallel grouping system is a system formed by selecting two or more symbols to simply group the whole again and again; the composite grouping system is a system formed by compound grouping.

Selection of grouping flags

The selection of grouping flags is the key to statistical grouping. Grouping marks are the standards or basis for dividing a homogeneous population into different groups. Once the grouping mark is selected, it will inevitably highlight the qualitative difference of the overall group under this mark, and other differences will be invisible. Improper selection of grouping signs will not only fail to show the fundamental characteristics of the phenomenon, but will even confuse the nature of things and distort the true socio-economic situation.

The correct choice of grouping marks must be based on the purpose of the statistical research task, and the marks that reflect the essential differences and internal connections of the phenomenon must be used as grouping marks.

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