i am doing research on determinants of crop diversity and poisson regression result is as follows:
poisson cereal farmsize gender age hhsize impseed hhplotdis irr awarness livestock i.oxen i.ti e
> du income es numplot productio sccs, vce(robust)

Iteration 0: log pseudolikelihood = -289.59357
Iteration 1: log pseudolikelihood = -289.55671
Iteration 2: log pseudolikelihood = -289.55668
Iteration 3: log pseudolikelihood = -289.55668

Poisson regression Number of obs = 200
Wald chi2(22) = .
Prob > chi2 = .
Log pseudolikelihood = -289.55668 Pseudo R2 = 0.1392

goodness of fit result
poisgof

Deviance goodness-of-fit = 2.75826
Prob > chi2(177) = 1.0000

Pearson goodness-of-fit = 2.713196
Prob > chi2(177) = 1.0000

my question is is it possible to say the model is correct with missing wald chi2(22)?


thank you in advance