Сега точно ми попадна това... много е ценно. Всеки бъдещ FX герой трябва да си принтне и да си го закачи пред компютъра
Nonsense correlations and Other Matters
Correlation coefficients must be interpreted with care. Many coefficients that are both numerically large and statistically significant by tests to be described later may contain no real information. That statistical significance has been achieved does not necessarily imply that a meaningful and useful relationship has been found. The crucial question is: What has caused the observed covariation? If there is a theory about the joint variation of X and Y, the sign and the size of the correlation coefficient may lend support to that theory, but if no such theory exists or can be devised, the correlation may be clasified as a nonsense correlation.
Nonsense correlations and Other Matters
Correlation coefficients must be interpreted with care. Many coefficients that are both numerically large and statistically significant by tests to be described later may contain no real information. That statistical significance has been achieved does not necessarily imply that a meaningful and useful relationship has been found. The crucial question is: What has caused the observed covariation? If there is a theory about the joint variation of X and Y, the sign and the size of the correlation coefficient may lend support to that theory, but if no such theory exists or can be devised, the correlation may be clasified as a nonsense correlation.
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