Set one or more of coefficients to a specific integer

Question

I am using a standard lm model and would like to set the coefficients of one or more of my variables to a specific integer.

For example, I would like the coefficien

Answer 1

You can use the offset term in the formula and include the desired coefficient and variable therein:

df<-data.frame(aa=1:6,bb=2:7,cc=c(4,2,7,5,8,3))

lm(cc ~ aa + offset(647*bb), data = df)

So this is regressing cc on aa plus the fixed term bb * 647. For more than one given coefficient, add the appropriate additional offset() terms.