[Verse 1] When categories meet your regression line Like gender, color, brand design You can't just plug in words like "blue" Numbers need a different view Transform each group to zero-one Binary codes for everyone Male gets one, female gets zero This numeric dance makes math your hero [Chorus] Dummy variables, zero or one Categories coded till the math is done If you're in the group, you get the one Otherwise zero, and the work's begun Coefficients tell the story clear How much that group shifts up or here Dummy variables, the regression key Making categories quantifiably free [Verse 2] Pick your reference, leave it out That's the baseline, without a doubt If you have red, green, and blue Code just two, let one shine through The missing group becomes your base All others measured from that place Intercept shows the reference mean Other coefficients reveal the scene [Chorus] Dummy variables, zero or one Categories coded till the math is done If you're in the group, you get the one Otherwise zero, and the work's begun Coefficients tell the story clear How much that group shifts up or here Dummy variables, the regression key Making categories quantifiably free [Bridge] When you read that coefficient Ask what premium's sufficient Three point seven for the college grad Means they earn that much more, not bad Above the high school baseline wage Dummy variables turn the page From qualitative to quantified Statistical stories can't hide [Verse 3] Interaction terms can multiply Dummy with continuous, watch it fly Gender times experience shows How differently each career grows Perfect multicollinearity Happens when dummies aren't free n minus one, remember well Or your regression model's spell will fail [Chorus] Dummy variables, zero or one Categories coded till the math is done If you're in the group, you get the one Otherwise zero, and the work's begun Coefficients tell the story clear How much that group shifts up or here Dummy variables, the regression key Making categories quantifiably free [Outro] From words to numbers, clean and bright Dummy variables make it right Zero-one, the magic code Categories on the regression road
← Serial Correlation and Durbin-Watson | Interaction Terms →