# Trendline formula in R [closed]

I have created a simple scatterplot to analyse the correlation between two variables, x and y. Using the abline command, I added a trendline to this data. I now want to know the formula for this trendline. Is there a command that will give this formula as one is able to do in a simple Excel scatterplot?

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Welcome to the site, @Kait. Note that purely R questions belong on Stack Overflow, whereas CV is for questions about the statistical content. We will migrate your Q over there for you in time(please don't cross-post SE strongly discourages this), but 1st we should help you formulate it (here are a couple of relevant discussions: how-to-ask-question-related-to-the-use-of-r, & how-to-make-a-great-r-reproducible-example). Can you paste your code into your Q? –  gung Oct 11 '12 at 3:37
I for one provided an example on how to display regression equation in a scatter plot on Stack Overflow. There are plenty of other related threads, IMO, and SO is better suited for such questions. –  chl Oct 11 '12 at 10:35

## closed as off topic by chl♦Oct 11 '12 at 10:35

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This should get you going.

x <- sample(1:100, 100, replace = TRUE)
y <- x + rnorm(100, sd = 4)
mydf <- data.frame(x = x, y = y)
plot(y ~ x, data = mydf)
model <- lm(y ~ x, data = mydf)
abline(model, col = "red")
summary(model)
coef(model)


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Search for lm command and you can get linear model formula from it.