. xtreg (AB9 Dne9* Dnr9* Dpe9* Dnr9*)
note: Dnr9 omitted because of collinearity

Random-effects GLS regression Number of obs = 342
Group variable: ID Number of groups = 2

R-sq: Obs per group:
within = 0.0000 min = 171
between = 0.0000 avg = 171.0
overall = 0.0177 max = 171

Wald chi2(3) = 6.09
corr(u_i, X) = 0 (assumed) Prob > chi2 = 0.1072

------------------------------------------------------------------------------
AB9 | Coef. Std. Err. z P>|z| [95% Conf. Interval]
-------------+----------------------------------------------------------------
Dne9 | -1.556464 1.428468 -1.09 0.276 -4.35621 1.243281
Dnr9 | -.5548192 1.156174 -0.48 0.631 -2.820879 1.711241
Dpe9 | -1.080229 .5846352 -1.85 0.065 -2.226093 .065635
Dnr9 | 0 (omitted)
_cons | .006164 .0184596 0.33 0.738 -.0300162 .0423442
-------------+----------------------------------------------------------------
sigma_u | 0
sigma_e | .25039348
rho | 0 (fraction of variance due to u_i)
------------------------------------------------------------------------------




Does anyone know how to remove this constant to get values for dummies?