April 2024
Beginner to intermediate
500 pages
24h 20m
English
Content preview from Python Programming in Context, 4th Edition
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5.6 Correlating Data
Correlation measures the strength and direction of the relationship between two variables. Expressed another way, correlation measures the tendency of two variables to increase or decrease at the same time. This measure is often called the correlation coefficient. Returning to the earthquake data, we could ask the question “Is the magnitude of an earthquake correlated with its depth?”
Although several algorithms are available for calculating a correlation coefficient for a sample, we will use the Pearson correlation coefficient, which yields a number between −1 and 1 to measure the relationship between two variables. The formula for calculating this coefficient is
where and are the means of the two variables x and y
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