1. Quantitative information:
Measure the size of a certain index amount for each observation unit.
Measuring data:
In quantitative data, if the value of the index can be measured with units of weight and measure, or even with decimals (the accuracy of mark measurement), it is called "measurement data". For example, the data obtained by measuring the height of normal adult men cm), weight of kg), hemoglobin g/U, total iron binding force (μmol/U, etc. are first quantitative data, and they are still quantitative data, and they are further subdivided into the data.
Counting information:
In quantitative data, if the value of the index can be measured with units of weight and measure, but cannot be taken with decimals (that is, it can only be taken with integers, usually positive integers), it is called "counting data". For example, the pulse number (times/min) of a normal adult man is measured and the number of pull-ups (times/min) is measured.
2. Qualitative information:
Observe the status of a certain indicator quality for each observation unit.
Nominal information:
In qualitative data, if there is essentially no quantity or order between different conditions of the index quality, it is called "nominal data". For example, all employees of a certain unit record the information on each person's situation according to the ABO blood type system CA type, B, AB type, O type): For example, all employees of the vegetable market record the information on each person's situation according to occupations (workers, farmers, intellectuals, soldiers,...).
Orderly information:
In qualitative data, if there are essentially quantity or order between different conditions of the index quality, qualitative data that is divided into quantity or order in nature, it is called "orderly data". For example, patients with a certain disease divide the obtained data according to the efficacy after treatment (cured, effective, improved, ineffective, and death): For example, patients with a certain disease divide the obtained data according to the hilar density level C+, ++, and +++).