In-Service Performance Evaluation: Guidelines for the Assembly and Analysis of Data (2022) / Chapter Skim
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Pages 42-43
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42 Fortunately, traffic crashes with safety features are relatively rare events, so even when an ISPE is conducted statewide over 5 years with a relatively large inventory of installed hardware, the number of crashes will likely still be small, perhaps as few as 10 cases. As the number of cases included in an ISPE increases, confidence in the observations and ability to make inferences from the ISPE evaluation measures likewise increases.
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From page 43... ...
Sharing and Comparing Results 43 The weight applied to each individual result is a measure of the certainty of the estimate; results with greater uncertainty are given less weight. The weight assigned to an individual study is a function of the SE of the estimate, as follows: = 1 SE2 wi i The population standard deviation (σ)
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