How to Calculate the Value of the Slope of the Least-Squares Regression Line in Excel


Microsoft Excel allows you to graph your data into a chart. Then using the chart, Excel can put in a trend line. The trend line is also known as the least-squares regression line. This line has a formula, y=mx+b. B is the y-intercept. M is the slope. X is the point on the x-axis where the spot is and y is the point on the y axis where the spot is. Excel will graph and define your line's equation for you, so the slope is the m in y=mx+b. For example, if the line's equation is y=2*5+4, then the slope is 2.

  • Graph your data using whichever type of graph you find appropriate. Each data set is different, but most likely, you will use a line graph that plots the points on the graph.

  • Click on your graph in Excel.

  • Click the "Layout" tab, then click "Trendline." Select the "Linear" trend line.

  • Click "More Trendline Options." Check the box next to "Display Equation on chart."

  • Find the slope in the equation. The equation is formatted as y=mx+b. The slope is the number in the m spot.

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