1. Exploratory Data Analysis
1.3. EDA Techniques
1.3.3. Graphical Techniques: Alphabetic
1.3.3.26. Scatter Plot

1.3.3.26.6.

Scatter Plot: Exponential Relationship

Scatter Plot Showing Exponential Relationship

Discussion

Note that a simple straight line is grossly inadequate in describing the relationship between X and Y. A quadratic model would prove lacking, especially for large values of X. In this example, the large values of X correspond to nearly constant values of Y, and so a non-linear function beyond the quadratic is needed. Among the many other non-linear functions available, one of the simpler ones is the exponential model

for some A, B, and C. In this case, an exponential function would, in fact, fit well, and so one is led to the summary conclusion of an exponential relationship.