The law of weight applicable to the method of least squares error, is

- 1
  
  The weight of the arithmetic mean of a number of observations of unit weight, is equal to the number of observations
- 2
  
  The weight of the weighted arithmetic mean of a number of observations, is equal to the sum of the individual weights of observations
- 3
  
  The weight of the sum of the quantities added algebraically is equal to the reciprocal of the sum of the reciprocals of the individual weights
- 4
  
  The weight of the product of any quantity multiplied by a constant is equal to the weight of that quantity divided by the square of that constant

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