Stability Evaluation of the Goaf Based on Combination Weighting and Cloud Model

Table 4

Commonly used dimensionless methods.

Serial no.	Dimensionless method	Function expressions
Method 1	Range transformation method (MMS)
Method 2	Standardization method (S)
Method 3	Averaging method (MC)
Method 4	Differentiated polarization transformation method; (MMS, NMMS)
Method 5	Natural logarithm method (ln)
Method 6	Logarithm with base 10 (log10)
Method 7	Summation normalization (SN)
Method 8	Square and summation normalization (SSN)