STAR*NET V6 - Circe

Chapter 8 Analysis of Adjustment Output
8.7 Adjustment Statistical Summary
The Statistical Summary, although short, contains some of the most useful and important
information in the entire adjustment listing. You should always review it, especially if
you are having problems with your adjustment.
Statistical Summary
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Convergence Iterations = 4
Number of Stations = 7
Number of Observations = 32
Number of Unknowns = 16
Number of Redundant Obs = 16
Observation Count Sum Squares Error
of StdRes Factor
Coordinates 3 0.62 0.64
Angles 10 10.04 1.42
Directions 2 0.08 0.28
Distances 8 5.84 1.21
Az/Bearings 1 0.01 0.02
Zeniths 8 0.48 0.35
Total 32 17.06 1.03
Adjustment Passed the Chi Square Test at 5% Level
Statistical Summary
The first item in this section indicates how many iterations were performed to get
convergence. If an adjustment does not converge, the word “failure” will follow the
number of iterations performed to alert you to the fact. If increasing the number of
iterations does not help, other problems in your network data may be preventing a proper
solution. In this case, these problems must be found and corrected!
The second item indicates how many stations are actually included in the network. Any
station included in your data file, but not actually connected to any other station by one
or more observations, is not included in this count.
The next three lines indicate the numbers of observations, unknowns and redundant
observations in the network. The number of redundant observations, often called the
“Degrees of Freedom” of the network, is equal to the number of observations in the
network minus the number of unknowns. This is also sometimes called the redundancy
of a network.
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