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R Data Analysis Cookbook - Second Edition by Kuntal Ganguly

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Overlay a regression line on a scatterplot

The following code first generates the scatterplot and then builds the regression model using lm. It then uses the abline() function to overlay the regression line on the existing scatterplot:

> plot(mpg ~ horsepower) > reg <- lm(mpg ~ horsepower) > abline(reg) 

The following diagram is the scatterplot:

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