Two frequency polygons of serum cholesterol, on the same axes: a graph where the horizontal axis is labeled serum cholesterol and numbered 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and the vertical axis is labeled Relative frequency and numbered 0, .1, .2, .3, .4.

A series of solid straight lines goes from the horizontal axis at 2.5 to join the points defined by serum cholesterol and relative frequency as follows: 2.5 and 0, 3.5 and 0.03, 4.5 and 0.13, 5.5 and 0.30, 6.5 and 0.23, 7.5 and 0.221, 8.5 and 0.06, 9.5 and 0.02, 10.5 and 0.02, 11.5 and 0.

A second series of broken straight lines goes from the horizontal axis at 2.5 to join the points defined by serum cholesterol and relative frequency as follows: 2.5 and 0, 3.5 and 0.04, 4.5 and 0.23, 5.5 and 0.38, 6.5 and 0.30, 7.5 and 0.06, 8.5 and 0.

The solid straight lines are labeled Stroke cases. The broken straight lines are labeled Controls.

Back to Clinical Biostatistics: Data, frequencies, and distributions.

This page maintained by Martin Bland.

Last updated: 2 August, 2006.