65803 is the intercept of the regression line.138.56 is the slope of the regression line.In our example, we get the below equation: y = 138.56x + 65803 Suppose you have the dataset as shown below and you want to find out the slope and intercept for this data: If you prefer to visualize your data and the regression line, you can plot the data in a scatter chart and use it to find the slope and the intercept for the trend line (also called the line of best fit). Method 2 – Using a Scatter Chart to get the Slope Value There should be more than one set of points, otherwise the SLOPE function returns a #DIV! error.In case you give it unequal sized ranges, you will get a #N/A error There should be an equal number of x and y values, when used as input for the SLOPE function.In case there is ‘0’ in any cell/cells, it would be used in the calculation.In case any of the cells are blank or contains a text string, these would be ignored Arguments of the SLOPE function have to be numerical (DATE values are also accepted).Here are a few points to remember when finding the slope of a regression line using the SLOPE function: Y = 138.56*165 + 65803.2īoth slope and intercept values can be positive or negative Points to Remember when Using the SLOPE Function in Excel So now, if I ask you what would be the income of anyone whose height is 165 cm, you can calculate the value easily. With this, our equation for this dataset becomes: Y = 138.56*X + 65803.2 Suppose you have the below dataset as shown below where I have the height (in cm) as X values and average annual income (in USD) as the Y values. If you do it the other way round, you will still get the result but it would be incorrect. Remember that you need to give the Y values as the first argument and X values as the second argument. Here, y_vals and x_vals each consist of an array or range of cells containing numeric dependent data values. The syntax for the slope function is: =SLOPE(y_vals, x_vals) While calculating slope manually could be hard, with the SLOPE function, you just need to give it the x and y values and it does all the heavy lifting in the backend. It finds the slope value of a given set of x-y coordinates in one step. The easiest way to calculate slope in Excel is to use the in-built SLOPE function. ![]() Thankfully, Excel has a formula for that as well, and I will cover how to calculate intercept in all the methods. In this equation, we have already calculated the slope, but to truly know what would be the Y value for a given X value, you also need to know the intercept. Let me explain it with the equation: Y = Slope*X + Intercept So if the height increases by 1 centimeter, the income is likely to increase by USD 138.Īpart from the slope, another thing you need to know about is the Intercept. ![]() In our example, if the slope value is 138, which means that there is a positive correlation between height and the income of people. The slope value can be positive or negative.
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