year. 1916 to 1992, by 4
V. prop. dem. vote
I. =1 if demwh, -1 if repwh
DPER. incumbent running
DUR. duration
g3. avg ann grwth rte, prev 3 qrts
p15. avg ann inf rate, prev 15 qtrs
n. quarters of good news
g2. avg ann grwth rte, prev 2 qrts
gYR. ann grwth rte, prev year
p8. avg ann inf rate, prev 8 qtrs
p2YR. inf rte over 2 yr period
Ig2. I*g2
Ip8. I*p8
demwins. =1 if V > .5
In. I*n
d. =1 in 1920, 1944,1948
Id. I*d
Ig3. I*g3
Ip151md. I*p15*(1-d)
In1md. I*n*(1-d)