Graph description: Figure 3. Scree plot for Table 3

A scatter plot. The horizontal axis shows principal component number, labelled 1 to 21. The vertical axis shows eigenvalue, labelled 0 to 2. Points are shown for each integer component number. Component 1 has eigenvalue about 1.6, component 2 has eigenvalue about 1.5, component 3 has eigenvalue about 1.4, component 4 has eigenvalue about 1.3, then the eigenvalues fall steadily until component 21 has eigenvalue about 0.5. A straight lines has been drawn on the plot. The line goes from about principal component = 1, eigenvalue = 1.5, to principal component = 21, eigenvalue = 0.5. All the points are close to the line and there is no scree.

Back to Measurement in Health and Disease: Composite scales and scores.

This page maintained by Martin Bland.
Last updated: 20 May, 2008.