[R] Linear Regression with lm Forcing the Slope to Equal 1

[Duncan Murdoch]

On 17/11/2007 8:29 PM, Tom La Bone wrote:
> Is there a way to do a linear regression with lm (having one predictor
> variable) and constrain the slope of the line to equal 1?
> 

You could use the offset parameter to do this, e.g.

x <- 1:20
y <- x + rnorm(20)
lm(y ~ 1, offset=x)

Duncan Murdoch