![]() ![]() The visual result sums up the strength of the relationship, albeit at the expense of not providing as much detail as the table above. Lastly, select "Display R-squared value on chart". ![]() To add the R 2 value, select "More Trendline Options" from the "Trendline menu. In the dialog box, select "Trendline" and then "Linear Trendline". To add a regression line, choose "Add Chart Element" from the "Chart Design" menu. We can chart a regression in Excel by highlighting the data and charting it as a scatter plot. The time period under study may not be representative of other time periods. Adding Trend Lines and Regression Analysis to Your Scatter Plot.The data is a time series, so there could also be autocorrelation.There are only 20 observations, which may not be enough to make a good inference.Visa is a component of the S&P 500, so there could be a co-correlation between the variables here.With only one variable in the model, it is unclear whether V affects the S&P 500 prices, if the S&P 500 affects V prices, or if some unobserved third variable affects both prices. ![]() However, an analyst at this point may heed a bit of caution for the following reasons:
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