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1 IV/2SLS models. 2 Z i =1 1 =0.57 Z i =0 0 =0.80.

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Presentation on theme: "1 IV/2SLS models. 2 Z i =1 1 =0.57 Z i =0 0 =0.80."— Presentation transcript:

1 1 IV/2SLS models

2 2 Z i =1 1 =0.57 Z i =0 0 =0.80

3 3  0 =3186  1 =3278

4 4

5 5

6 6

7 7 Vietnam era service Defined as 1964-1975 Estimated 8.7 million served during era 3.4 million were in SE Asia 2.6 million served in Vietnam 1.6 million saw combat 203K wounded in action, 153K hospitalized 58,000 deaths http://www.history.navy.mil/library/online/america n%20war%20casualty.htm#t7

8 8 Vietnam Era Draft 1 st part of war, operated liked WWII and Korean War At age 18 men report to local draft boards Could receive deferment for variety of reasons (kids, attending school) If available for service, pre-induction physical and tests Military needs determined those drafted

9 9 Everyone drafted went to the Army Local draft boards filled army. Priorities –Delinquents, volunteers, non-vol. 19-25 –For non-vol., determined by age College enrollment powerful way to avoid service –Men w. college degree 1/3 less likely to serve

10 10 Draft Lottery Proposed by Nixon Passed in Nov 1969, 1 st lottery Dec 1, 1969 1st lottery for men age 19-26 on 1/1/70 –Men born 1944-1950. Randomly assigned number 1-365, Draft Lottery number (DLN) Military estimates needs, sets threshold T If DLN<=T, drafted

11 11 Questions? What are the research questions? What can we NOT obtain estimates from observational data?

12 12 If volunteer, could get better assignment Thresholds for service DraftYear of BirthThreshold 19701946-50195 19711951125 19721952 95 Draft suspended in 1973

13 13 Model Sample, men from 1950-1953 birth cohorts Y i = earnings X i = Vietnam military service (1=yes, 0=no) Z i = draft eligible, that is DLN <=T (1=yes, 0=no)

14 14 Put this all together Model of interest Y i = β 0 + x i β 1 + ε i First stage x i = θ 0 + z i θ 1 + μ i θ 1 =(dx/dz)

15 15 Intention to treat y i = π o + z i π 1 + v i π 1 = dy/dz=(dy/dx)(dx/dz)

16 16 Divide ITT by 1 st stage = (dy/dx)(dx/dz)/(dx/dz) = dy/dx Recall the equation of interest y i = β 0 + x i β 1 + ε i The units of measure are β 1 = dy/dx

17 17 β 1 = dy/dx β 1 = [  1 -  0 ]/[ 1 - 0 ]

18 18

19 19 1 o

20 20 Graph of  1 -  0

21 21  1 -  0 in numbers

22 22 Β iv = (  1 -  0 )/( 1 - 0 ) = -487.8/0.159 = $3067.9 CPI 78 = 65.2 CPI 81 =90.9 65.2/90.9 =.7173.717*3067.92 = $2199

23 23

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25 25 1 o

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