1980 to 1988
unemployment claims
=1 if have enterprise zone
=1 if year == 1981
=1 if year == 1982
=1 if year == 1983
=1 if year == 1984
=1 if year == 1985
=1 if year == 1986
=1 if year == 1987
=1 if year == 1988
=1 if city == 1
=1 if city == 2
=1 if city == 3
=1 if city == 22
log(uclms)
luclms - luclms[_n-1]
ez - ez[_n-1]
city identifier, 1 through 22