relevant information
1, population standard deviation of econometric equation. Population standard deviation is the average deviation of the marked value of each unit from its arithmetic mean, which is expressed by σ. Population variance is the average of the sum of squares of deviations between numerical values and their arithmetic mean in a set of data. Population standard deviation is the square root of population variance.
2. Standard deviation is the most commonly used and important measure of variability. The standard deviation takes the average value of the distribution as the reference point, and considers the distance between each data and the average value to measure the variability. It depends on whether the data is close to or far from the average.
3. Econometrics is based on certain economic theories and statistical data. Applied mathematics, statistical methods and computer technology. Taking the establishment of econometric model as the main means. Quantitative analysis of the relationship between economic variables with random characteristics is an economic discipline. The main contents include theoretical econometrics and applied econometrics.
4. The standard deviation is used to reflect the degree of change. When the units of the two groups of observations are the same and the mean values are similar, the greater the standard deviation, the greater the degree of variation between the observations. The distribution of observed values around the average value is discrete, and the representativeness of the average value is very poor. Conversely, the smaller the standard deviation. It shows that the variation between the observed values is small, the observed values are densely distributed around the mean value, and the mean value is representative.