The figure shows a scatter plot of two pulse rates, the first measurement on the horizontal axis, the second on the vertical axis. There is a fairly strong relationship (r=0.68). The line of equality is shown at 45 degrees to the two axes. This is the line on which the points would all lie if the two pulse measurements were the same. The diagram also shows vertical and horizontal lines through the means of the two variables. These cross on the line of equality.

A vertical line is drawn at first pulse = 60 beats per minute, with a shaded area on either side from 55 to 65 beats per minute.

Back to Regression towards the mean.

This page maintained by Martin Bland.

Last updated: 19 January, 2004.