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sampling
It's simple but its quality is not comparable to Maximum likelihood estimation method.
The acronym OLS as pertaining to the field of statistics stands for Ordinary Least Squares, the standard linear regression procedure. This is the standard approach to overdetermined systems.
diferece between ratio and regression
When using front-end estimation, we add or subtract the front digits, and then adjust for a more accurate estimation by estimating the sum of the digits to the right of the decimal point.