N = 200
df = data.frame(x = 1:N, y = 2+1:N*3 + rnorm(N))
lm(y ~ I(x+2) + 0, df)
# Call:
# lm(formula = y ~ I(x + 2) + 0, data = df)
#
# Coefficients:
# I(x + 2)
#     2.97