Derivation
variable: illfrest1 [decade estimate of ill house start] (table[s]: tb_tbxto2007)
variable: illfrmm1 [month of ill house start] (table[s]: tb_tbx, tb_tbxto2007)
variable: illfryear1 [year of ill house start] (table[s]: tb_tbx, tb_tbxto2007)
variable: illfrdate1 [date of ill house start] (table[s]: tb_tbxto2007)
recode illfrmm1 0=.
replace illfryear1=1895 if illfrest1==1
replace illfryear1=1905 if illfrest1==2
replace illfryear1=1915 if illfrest1==3
replace illfryear1=1925 if illfrest1==4
replace illfryear1=1935 if illfrest1==5
replace illfryear1=1945 if illfrest1==6
replace illfryear1=1955 if illfrest1==7
replace illfryear1=1965 if illfrest1==8
replace illfryear1=1975 if illfrest1==9
replace illfryear1=1985 if illfrest1==10
replace illfryear1=1995 if illfrest1==11
replace illfryear1=1895 if illfrest1==12
replace illfryear1=1907 if illfrest1==13
replace illfryear1=1924 if illfrest1==14
replace illfryear1=1940 if illfrest1==15
replace illfryear1=1951 if illfrest1==16
replace illfryear1=1960 if illfrest1==17
replace illfryear1=1970 if illfrest1==18
recode illfryear1 9999=. 0=.
replace illfrdate1=mdy(illfrmm1,15,illfryear1) if illfrmm1~=. & illfryear1~=.
replace illfrdate1=mdy(6,15,illfryear1) if illfrmm1==. & illfryear1~=.
