Free Linear Regression Slope Calculator
Calculate the slope of a simple linear regression line from summary statistics of x and y data.
Slope (b1)
0.8333
Slope (b1) vs Number of Data Points (n)
Linear Regression Slope
The slope of the least-squares regression line measures the average change in y for each one-unit increase in x.
Formula
b1 = (n × Σxy - Σx × Σy) / (n × Σx² - (Σx)²)
This is derived by minimizing the sum of squared residuals. A positive slope indicates a positive relationship; negative slope indicates an inverse relationship.
Example Calculation
Given n=10, Σxy=3500, Σx=150, Σy=200, Σx²=2850.
- 01Numerator = 10(3500) - 150(200) = 35000 - 30000 = 5000
- 02Denominator = 10(2850) - 150² = 28500 - 22500 = 6000
- 03b1 = 5000 / 6000 = 0.8333
Frequently Asked Questions
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