I ve a linear regression model. The dependent variable is log transformed ln_EBIT (EBIT is in Million EUR). The independent variable is a ratio between RD / Sales (both in million EUR).

The Coefficient is around -2,5.

If we change RD/SALES by 1 (unit), we’d expect EBIT to change by -2,5% or -250% percent?

Is the effect now -2,5% or -250%? I´m not quite sure if I have to multiple the coefficient with 100 because it is already a ratio?

Thanks in Advance,

rmk