Hello,
Try ?mean
abline(h = mean(y), col = "blue")
Hope this helps,
Rui Barradas
Em 03-07-2013 15:07, Birdada Simret escreveu:
Greetings to every body.
we know that for linear regression: two-parameter fitting in R: (for a and
b as slope and intercept)
[a] for y=ax+b type models we use: lm(y~x)
[b] for y=ax type models we use: lm(y~0+x) => forced to pass through
origin
Now I have question: what about y=b fitting? is there any model to
force or impose the ax to be zero
Let say
x <- c(1,2,3,4,5,6,7,8,9)
y <- c( 0.853,0.852, 0.854, 0.858, 0.862, 0.856, 0.858, 0.857, 0.863)
plot(y~x, xlim=c(0,10), ylim=c(0,1))
abline(lm(y~x),col="blue") # this doesn't give exact horizontal but
slightly inclined.
or is it as simple as, just find the intercept using the lm(y~x) , then
abline(h=intercept,col="red") ?
any comment or advice is greatly appreciated ;)
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