May 2017
Intermediate to advanced
294 pages
7h 33m
English
Content preview from Apache Spark 2.x Cookbook
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Calculating correlation
Correlation is a statistical relationship between two variables such that when one variable changes, it leads to a change in the other variable. Correlation analysis measures the extent to which the two variables are correlated. We see correlation in our daily life. The height of a person is correlated with the weight of a person, the load carrying capacity of a truck is correlated with the number of wheels it has, and so on.
If an increase in one variable leads to an increase in another, it is called a positive correlation. If an increase in one variable leads to a decrease in the other, it is a negative correlation.
Spark supports two correlation algorithms: Pearson and Spearman. The Pearson algorithm works with ...
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