What Is Gravel Root?

A scree test is a method that determines the number of factors based on a scree chart. R. B. Cartel proposed. In the main axis factor method, the variance contribution of the common factor is equal to the value of the characteristic root corresponding to the factor. Calculating the cumulative variance contribution rate can be replaced by calculating the cumulative characteristic root percentage. The number of factors can even be determined by directly observing the change of the characteristic root. When a characteristic root has a larger decrease than the value of the previous characteristic root, and this characteristic root is smaller, the subsequent characteristic root does not change much, indicating that adding factors corresponding to the characteristic root can only add little information. , So the first few feature roots are the number of common factors that should be extracted. ^[1]