In multiple linear regression, a dummy variable is a binary variable that is used to represent a categorical independent variable. These variables take on the value of 1 or 0, indicating the presence or absence of a particular category. For example, suppose we want to test whether stock returns were different in January than during the remaining months of a particular year, which is a type of market anomaly called the “January effect”, we include an independent variable that takes on value “1” if it is a January, and “0” if it is any other month of the year.
When using multiple dummy variables in a regression model, it is important to use one less dummy variable than the total number of categories.
Many years ago, I was exactly where you are today—a CFA Level I candidate juggling a demanding full-time career with the daunting CFA curriculum. Coming from a Computer Engineering background, finance was entirely new territory for me. And yes, it was tough!
I struggled with dense textbooks, late-night cramming, and the frustration of concepts that seemed impossible after a long workday. But after passing Level I (barely), I realized something had to change.
Studying Smarter, Not Harder
Using the Pareto Principle (80/20 rule), I distilled the vast CFA syllabus into essential, easy-to-understand nuggets. I leaned into visual summaries and bite-sized learning sessions that worked around my busy schedule. This smarter approach helped me clear Levels II and III on my first attempts with significantly less stress.
Why PrepNuggets?
I founded PrepNuggets to share the streamlined strategies and innovative learning methods that transformed my CFA journey. Our mission is simple: leverage technology to make CFA prep more effective, accessible, and enjoyable.
Join the PrepNuggets community today—sign up for your free account, and let our thoughtfully crafted materials propel you toward CFA success without unnecessary overwhelm.
Here’s to your CFA journey!
Keith Tan, CFA
Founder & Chief Instructor, PrepNuggets
About the Author
PrepNuggets
Keith is the founder and chief instructor of PrepNuggets. He has a wide range of interests in all things related to tech, from web development to e-learning, gadgets to apps. Keith loves exploring different cultures and the untouched gems around the world. He currently lives in Singapore but frequently travels to share his knowledge and expertise with others.
