Least squares adjustment is rigorously based on the theory of mathematical
probability, whereas in general, the other methods do not have this rigorous
base. As described later in the book, in a least squares adjustment, the following
condition of mathematical probability is enforced: The sum of the
squares of the errors times their respective weights is minimized. By enforcing
this condition in any adjustment, the set of errors that is computed has the
highest probability of occurrence. Another aspect of least squares adjustment
that adds to its rigor is that it permits all observations, regardless of their
number or type, to be entered into the adjustment and used simultaneously
in the computations. Thus, an adjustment can combine distances, horizontal
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