Visualizing Bivariate Statistics Using Ellipses Over a Scatter Plot

• Activity Number: 73 - SPEED: Statistical Computing and Statistics in Genomics Part 2
• Type: Contributed
• Date/Time: Sunday, August 7, 2022 : 5:05 PM to 5:50 PM
• Sponsor: Section on Statistical Graphics
• Author(s): Jyotirmoy Sarkar and Mamunur Rashid* and Siddhanta Phuyal
• Companies: Indiana University-Purdue University Indianapolis and DePauw University and DePauw University
• Keywords: Dot plot; Boxplot; Gaussian interval plot; Summary ellipse ; Regression lines; Coefficient of determination

Abstract

A scatter plot shows the relationship between two quantitative variables x and y. Sometimes, we can predict one variable as a linear function of the other using the least-squares regression lines of y on x or x on y. These two regression lines together suffice to identify the mean vector, the coefficient of determination, the correlation coefficient, and the ratio of the standard deviations (SD). So, do our proposed summary ellipses. Additionally, the inner ellipse reveals the SDs and the outer ellipse flags potential outliers.