Main courses: basic courses of mathematics (analysis, algebra, geometry), probability theory, mathematical statistics, operational research, computer foundation, applied stochastic process, practical regression analysis, time series analysis, multivariate statistical analysis, sampling survey, parameter statistics, statistical prediction and decision-making, risk management, etc. , and the basic courses selected according to the application direction.
Statistics: The science of collecting, processing, analyzing and interpreting data and drawing conclusions from them. Descriptive statistics: statistical methods for data collection, processing and description. Inferential statistic: A statistical method to study how to infer the overall characteristics by using sample data.
Variable: the characteristic that each observation will lead to different results. Classification variable: the observation result is expressed as a certain kind of variable. Rank variable: also known as ordered classification variable, the observation results show some ordered variable.
Metric variable: also known as quantitative variable, the observation result is numerical variable. Mean value: Mean value is the average value, sometimes especially the arithmetic average value. This is the average value calculated by other methods. The solution is to add up all the numbers first and then divide them by the number of numbers. This is a method to measure the concentration trend or average value.
Median: that is, choose the middle number. To find the median, you need to sort from small to large, and then see what the middle number is. Mode: Mode is the number with the highest frequency in the data set.