Statistical indicators describing the concentration trend: mean (arithmetic mean, geometric mean and median), percentile (position parameter used to determine the range of medical reference values, P50 is the median) and mode. Arithmetic mean: it is suitable for medicine with symmetrical distribution data, especially normal distribution data or approximate normal distribution data; Geometric mean: lognormal distribution data (frequency chart is generally positive and biased), geometric series; Median: It is suitable for data with various distributions, especially for data with partial peak distribution, and it can also be used for data with uncertain values at the end of distribution.

1. index is a concept to explain the quantitative characteristics of the population, and it is the synthesis of its values, so it is also called comprehensive index. In practical statistical work and statistical theory research, the concept of describing the quantitative characteristics of the population is often directly called index.

2. Indicators are concepts that describe the overall comprehensive quantitative characteristics. For example, in the industrial census, all industrial enterprises constitute the whole, including the total number of industrial enterprises, industrial employees, total wages, average wages, total fixed assets, total profits, etc. They are all indicators and reflect the overall quantitative characteristics from different aspects. A complete index generally consists of two parts: index name and index value, which embodies the characteristics of material stipulation and quantity stipulation. For example, after statistical investigation, it is known that the original value of fixed assets of an enterprise is 9,654,380,000 yuan, which is an indicator and describes the overall comprehensive quantitative characteristics. Including two aspects: the name of the index, that is, the original value of fixed assets, and the index value, that is, 91100,000 yuan.

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(1) First of all, the values of many statistical indicators are summarized from the quantity mark values of the whole unit. That is to say, it can be the sum of the symbols of the whole unit or the sum of the numbers of the whole unit. For example, the index of industrial added value in a certain region is the summary of industrial added value of enterprises in that region.

(2) Second, there is a certain transformation relationship between them. This is mainly because there is a conversion relationship between indicators and quantitative indicators, that is, due to different research objectives, if the original statistical population and the original statistical indicators become a whole unit, the corresponding statistical indicators will become quantitative indicators, and the indicator names will become symbols, and the indicator values will become symbolic values or variable values.

4. Stock indicators belong to the category of statistics, and all data are used to demonstrate stock trends, transactions and so on. Indicators are mainly divided into trend indicators, strength indicators and trading indicators. Originated in the futures market, initiated by george ryan. It reflects the strength of the price trend through the fluctuation range of the highest price, lowest price and closing price of the day or in recent days.