1. Indicators describing the concentration trend: arithmetic mean, median and geometric mean.
2. Indicators describing discrete trends: variance and standard deviation, range, percentile and coefficient of variation.
3, arithmetic average: also known as the average, with? Represents the population average, and x represents the sample average.
4. Median: refers to the observed value in the middle of a group of observed values arranged from small to large.
5. Geometric mean: it is an index to describe the trend in skewed distribution data set. It is suitable for equal ratio data and lognormal distribution data.
6. Usage of variance and standard deviation: an indicator describing the discrete trend of symmetrically distributed data.
7. Use of percentile: It is used to describe the level of skewed distribution data at a certain percentile and determine the medical reference value range of skewed distribution data.
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