In Direct Assessment (DA), the Pearson correlation coefficient is used to statistically assess the relationship between indirect inspection data and direct examination findings when evaluating cathodic protection (CP) effectiveness. DA is a structured process used to assess the integrity of buried pipelines by combining indirect inspection methods with direct examinations at selected locations. The Pearson correlation coefficient (r) measures the strength and direction of the linear relationship between two variables. It ranges from -1 to +1, where +1 indicates a pe....
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