Health Sciences 3801A/B Lecture 4: Lecture 4 - Correlation & Regression

• School: Western University
• Department: Health Sciences
• Course: Health Sciences 3801A/B
• Professor: Andrew Johnson

Document Summary

Both variables are increasing or decreasing at the same time. As one variable increases, the other decreases, or vice versa. A perfect positive correlation (r = +1. 00) A perfect negative correlation (r = - 1. 00) It always moves from the left to right. Curvilinear relationship a correlation starts off negative then becomes positive, or vice versa. The form of the relationship overall would be positive, but if you deconstructed the relationship, it is almost perfect for the first and second part of the curve. You must first consider the form of the relationships since correlation coefficients are only appropriate for the description of linear relationships. As the size of the ellipse about the line of best-fit decreases, the relationship b/w the variables becomes larger. Steeper slope w/ less scatter about the line. The line is shallower, the slope is less, more variability which decreases the relationship b/w the variable.