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Numerical C: Applied Computational Programming with Case Studies by Philip Joyce

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© Philip Joyce 2019
P. JoyceNumerical Chttps://doi.org/10.1007/978-1-4842-5064-8_6

6. Correlation and PMCC

Philip Joyce1 
(1)
Goostrey, UK
 

The topics of Correlation and Product Moment Correlation Coefficient (PMCC) are related. They both concern scatter graphs. You will have seen simple scatter graphs of, say, people’s height plotted against their weight or the value of a car plotted against its age.

Scatter Graphs and Correlation

In Figure 6-1 we see that, in general, as people get taller they get heavier and that as a car gets older its value decreases.
../images/480762_1_En_6_Chapter/480762_1_En_6_Fig1_HTML.png
Figure 6-1

Correlation scatter graphs

The first of the two graphs shows that as the x value rises, the ...

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