A scatter diagram.
The horizontal axis is labeled "Variable X" and numbered 2, 4, 6, and 8. The vertical axis is labeled "Variable Y" and numbered 2, 4, 6, and 8. Each of the 50 observations is shown by a small diamond positioned at that subject's Variable X and Variable Y.
There is a relationship between X and Y. When X is small, Y tends to be large. When X is large, Y tends to be small.
When X = 3, Y ranges from = 4.5 to 6.5. When X = 7, Y ranges from = 3 to 5.
The correlation coefficient is r = -0.3.
Back to Clinical Biostatistics: Correlation.
This page maintained by Martin Bland.
Last updated: 30 August, 2006.