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I am trying to add regression line equation, R square and P value to my plot, any thoughts on how I can do it?

Here is the code that I am using in R:

plot<- plot(Q,CALCIUM.DISSOLVED) fit<-(lm(CALCIUM.DISSOLVED ~ Q)) abline (fit)
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Using the data set cars

m <- lm(dist ~ speed, data = cars) plot(dist ~ speed,data = cars) abline(m, col = "red")

Here we use summary() to extract the R-squared and P-value.

m1 <- summary(m) mtext(paste0("R squared: ",round(m1$r.squared,2)),adj = 0) mtext(paste0("P-value: ", format.pval(pf(m1$fstatistic[1], # F-statistic m1$fstatistic[2], # df m1$fstatistic[3], # df lower.tail = FALSE)))) mtext(paste0("dist ~ ",round(m1$coefficients[1],2)," + ", round(m1$coefficients[2],2),"x"), adj = 1)
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2 Comments

Thanks, how do you adjust the number of digits for P value and adding the regression equation?
For ggplot2 users: stackoverflow.com/questions/7549694/…

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