Self-assessments for: Network Quality Assessment by Measures of Reliability

These self-assessment problems accompany the mini course Network Quality Assessment by Measures of Reliability.

Problem 1

What does network reliability mean? Give a simple example of a measurement with 100% redundancy.

Problem 2

What is:

a) A redundancy number?

b) An absorption number?

Problem 3

If you do a network adjustment to find the following:


    \begin{align*} \mathbf{C}_{\hat{\mathbf{r}}}\mathbf{C}_{\mathbf{l}}^{-1} & = \begin{bmatrix} 0.56 & -0.31 & -189.80 & 41.17 & 139.81 \\ -0.31 & 0.63 & 18.12 & -94.75 & 207.64 \\ 0.00 & 0.00 & 0.21 & 0.00 & -0.27 \\ 0.00 & 0.00 & 0.00 & 0.04 & -0.09 \\ 0.00 & 0.00 & -0.27 & -0.09 & 0.57 \\ \end{bmatrix} \end{align*}


a) What is the total redundancy?
b) What are the individual redundancy numbers?
c) Absorption numbers?
d) What is the average redundancy?
e) Which two measurements are most redundant? (You can refer to them by number counted from the top left of this matrix.)
f) Does this network appear to be well controlled?

Problem 4

What matrix equation do you use to you compute redundancy in a pre-analysis situation, e.g. for design purposes before a survey has been carried out?

Problem 5

What’s the difference between internal reliability and external reliability?

Problem 6

What’s the test statistic for “data snooping”?

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