Modeling industrial location decisions in U.S. counties



APPENDIX B

The log-likelihood for this conditional logit problem is,

KJ

log Lcl = ΣΣnjk log pj/k.

k=1 j=1

From the first order condition for maximization with respect to one of the
fixed effects we obtain,

log Lcl

d.---= n njk - Pj∕knk = 0

γj      k=1

Solving the first order condition with respect to γj we arrive at,

K

j =exp(γj)

k=1


exp(β0zjk)

---J------------n---------nk
jJ=1 exp(β0zjk + γj)

Now, if we let,

Ik = log fp7----Z 4- )

j=1exp(β0zjk+γj)

we can express the γj sas,

exp(γj)=


____n____

PK=1 exp(β0 zjk + Ik )

23



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