Lorenzo,

Do you mean something like this?

Y = b0 + b1*x + b2*(D*x) + e,

Here D is a dummy variable specifying the group(s) that may have a different regression line (gender, race, etc.). If so, then yes: just estimate the model
in gretl and look at the regression output for b2.

Or are you talking about something else?

HTH,

PS

**From:** gretl-users-bounces@lists.wfu.edu [mailto:gretl-users-bounces@lists.wfu.edu]
**On Behalf Of **lorenzosmeraldi@libero.it

**Sent:** Monday, September 28, 2015 9:43 AM

**To:** gretl-users@lists.wfu.edu

**Subject:** [Gretl-users] Test a significant difference between two slope values

Hi,

in Gretl is possibile to test (i.e: t-test) the difference between slopes of two different regression lines?

Thanks.

Lorenzo.