Dear R-ers,
I conducted a regression analysis, and then intended to add the regression
function (y=4.33+1.07x) in a graph. But the following code can only give me a
text like y=a+bx. Who can help me out? Thank you very much in advance.
CODE
# Read data
x <- c(1, 2, 3, 4, 5, 6, 7, 8, 9)
y <- c(6, 5, 8, 9, 11, 10, 11, 12, 15)
data01 <- data.frame(x, y)
# Regression analysis
res.lm.y <- nls(y~a+b*x, start=list(a=1, b=2),data=data01)
# Obtain parameters
a<- coef(res.lm.y)["a"]
b<- coef(res.lm.y)["b"]
a
b
#a=4.33
#b=1.07
# Plot the results
def.par <- par()
par(mfrow=c(1,1),xaxs="i",yaxs="i")
plot(data01$x,data01$y,main="Fit",xlab="x",ylab="y")
lines(data01$x,predict(res.lm.y))
#=======
text (6, 13, expression(y==a+b*x))
#=======
## I intended to add text like y=4.33+1.07x
## but the above code added y=a+bx
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