Correlation paradox of binary classification system
نویسندگان
چکیده
Cost and speed considerations often conduct to measure/classify items according to two comprehensive and exclusive classes/categories (binary scale). Assume items are submitted for sorting according to binary scale (e.g. Type 1 and Type 2) using some sorting machine (SM). Repeatability or consistency testing of the SM is examined by the help of the correlation coefficient between the random variables denoting the number of items that were classified to the first category (for example) in two sequential sorting procedures. Paradoxical results lead to the conclusion that this measure is not suitable for measuring repeatability and further research is needed in order to find methods for checking consistency.
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