[Verse 1] When the data points are scattered all around And you need to find the pattern to be found Draw a line that fits the best it can That's regression, it's your analysis plan Normal curves and central limits guide the way P-values tell you what the numbers say [Chorus] OLS, find the line that's best Minimize those squares, put it to the test R-squared shows how much you can explain But correlation doesn't mean causation's plain Check your errors, make them white as snow That's how regression helps your business grow [Verse 2] Simple starts with just one X and Y Multiple adds more variables to try Coefficients tell you marginal effects Hold the others constant, that's what we expect Confidence intervals give you the range Null hypothesis, is there really change? [Chorus] OLS, find the line that's best Minimize those squares, put it to the test R-squared shows how much you can explain But correlation doesn't mean causation's plain Check your errors, make them white as snow That's how regression helps your business grow [Bridge] Watch for multi-collinearity VIF will set your variables free Hetero-skedasticity breaks the rules White's test and robust errors are your tools Omitted variables bias your game Endogeneity makes coefficients lame [Verse 3] Dummy variables for the categories Log transforms show elasticities Logistic when your outcome's yes or no Panel data lets your insights flow Fixed effects or random, choose your side Model specification is your guide [Chorus] OLS, find the line that's best Minimize those squares, put it to the test R-squared shows how much you can explain But correlation doesn't mean causation's plain Check your errors, make them white as snow That's how regression helps your business grow [Outro] Don't overfit or dredge your data mine Read the output, every single line When regression fits and when it doesn't work That's the knowledge that will make you smirk
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