Numerous studies have shown a pretty good correlation between low costs and superior investment results.
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My charts on the coefficient of performance among stock sectors show lessened correlation, a good sign.
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But Statistics for Education found a positive correlation of 0.12 between books and good results.
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The study found there was a positive link between good information technology and national test results, of 0.07 under the Spearman Rank Correlation statistical measurement system.
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