Figures & data
Figure 1 Connecting the means of the individual columns of data provides a crude approximation of the regression line. The slope is exactly 0.50 and the correlation is approximately r = 0.51. Many, though not all, of the points are closer to the offspring pea size mean of 9 on the Y‐axis than to the parental pea size mean of 10 on the X‐axis. The numeric data appear in Appendix B.
![Figure 1 Connecting the means of the individual columns of data provides a crude approximation of the regression line. The slope is exactly 0.50 and the correlation is approximately r = 0.51. Many, though not all, of the points are closer to the offspring pea size mean of 9 on the Y‐axis than to the parental pea size mean of 10 on the X‐axis. The numeric data appear in Appendix B.](/cms/asset/0bd3f956-1294-4e87-a420-74e5cfcf3e90/ujse_a_11910537_f0001_b.gif)
Figure 2. Correlation remains constant even though the slope of the line changes as a result of differences in variability between the two variables. In all three graphs, the correlation is identical at approximately r = 0.64. In 2A the variability in X is identical to the variability in Y. In 2B the variability in X was magnified to be larger than the variability in Y. In 2C the variability in Y was magnified to be larger than the variability in X. The numeric data appear in Appendix B.
![Figure 2. Correlation remains constant even though the slope of the line changes as a result of differences in variability between the two variables. In all three graphs, the correlation is identical at approximately r = 0.64. In 2A the variability in X is identical to the variability in Y. In 2B the variability in X was magnified to be larger than the variability in Y. In 2C the variability in Y was magnified to be larger than the variability in X. The numeric data appear in Appendix B.](/cms/asset/957fad34-9437-4b1f-a8ec-685a40a2067e/ujse_a_11910537_f0002_b.gif)
Table 1. Numeric Example Demonstrating that Adding or Subtracting an Offset from the Product-Moment Worsens the Prediction of Y from X.
Figure 3. Simplified diagram showing influences of three preceding generations of ancestors on the present day individual.
![Figure 3. Simplified diagram showing influences of three preceding generations of ancestors on the present day individual.](/cms/asset/c58cc077-5396-4ab7-8cb6-886f72a380aa/ujse_a_11910537_f0003_b.gif)
Table 2. Raw Data on Diameters of Parent and Daughter Seeds Generated from CitationGalton (1894) in Natural Inheritance.