IMMIGRATION POLICY AND THE AGRICULTURAL LABOR MARKET: THE EFFECT ON JOB DURATION



J1 = 0 if J* μo,
J
i= 1 if μ0 J* ≤ μλ,
J1 = 2 if μJ1 ≤ μ2,
J1
= 3 if μ2 J*.

where J1* = x1'α+ ε1 ; x1 is a vector of exogenous characteristics of individual 1; and ε1 is a
disturbance term. The characteristics include gender, marital status, English speaking ability, race
(black, white, and other), ethnicity (Hispanic and other), age, age squared, education, education
squared, US farm experience, US farm experience squared, and the year of interview (before 1993,
after 2001, and in-between).
4 We assume that ε1 is normally distributed with a mean of zero and a

standard deviation of σε. Then the likelihood function can be expressed as
where
Φ() indicates the cumulative distribution for the standard normal.

L (α, σε, μj | data) =


Ji =0
<


φ μ0- xα
I   σε   JJ Ji ='





J1=2


..'

μ2 xiα I ɪ I μ1 - xiα It-T1 ɪ( μ2 - xiα I

—---1- I - Φl —---1-1 - Φl —---1- I

σ J I σ J J=3     I σ J

ε                      ε        Ji =3                   ε


(1)


Suppose the cumulative distribution function of farm work duration (tij) for person i with
legal status
j is given as

Fij(t)=Pr(tij <t).

We denote its density function as fij(t). The probability for the spell to be of length of at least t,

usually called the survival function, is given as

Sij(t)=1-Fij(t).

4 See the Data section below for additional detail.



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