I want to generate a dummy variable. When the name for the position of "GS" is the same for the position "GOV" in a given province and year, this dummy variable equals one and otherwise it takes the value of zero. Many thanks!
Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input str24 province int year str15 position str32 name str7(starttime    endtime)
"anhui" 1952 "GS"  "曾希圣" "1952-01" ""       
"anhui" 1952 "GOV" "曾希圣" "1952-08" ""       
"anhui" 1953 "GS"  "曾希圣" "1952-01" ""       
"anhui" 1953 "GOV" "曾希圣" "1952-08" ""       
"anhui" 1954 "GS"  "曾希圣" "1952-01" ""       
"anhui" 1954 "GOV" "曾希圣" "1952-08" ""       
"anhui" 1955 "GOV" "曾希圣" "1952-08" "1955-03"
"anhui" 1955 "GOV" "黄岩"    "1955-03" ""       
"anhui" 1955 "GS"  "曾希圣" "1952-01" ""       
"anhui" 1956 "GS"  "曾希圣" "1952-01" ""       
"anhui" 1956 "GOV" "黄岩"    "1955-03" ""       
"anhui" 1957 "GS"  "曾希圣" "1952-01" ""       
"anhui" 1957 "GOV" "黄岩"    "1955-03" ""       
"anhui" 1958 "GS"  "曾希圣" "1952-01" ""       
"anhui" 1958 "GOV" "黄岩"    "1955-03" ""       
"anhui" 1959 "GS"  "曾希圣" "1952-01" ""       
"anhui" 1959 "GOV" "黄岩"    "1955-03" ""       
"anhui" 1960 "GOV" "黄岩"    "1955-03" ""       
"anhui" 1960 "GS"  "曾希圣" "1952-01" ""       
"anhui" 1961 "GS"  "曾希圣" "1952-01" ""       
"anhui" 1961 "GOV" "黄岩"    "1955-03" ""       
"anhui" 1962 "GS"  "李葆华" "1962-02" ""       
"anhui" 1962 "GS"  "曾希圣" "1952-01" "1962-02"
"anhui" 1962 "GOV" "黄岩"    "1955-03" ""       
"anhui" 1963 "GOV" "黄岩"    "1955-03" ""       
"anhui" 1963 "GS"  "李葆华" "1962-02" ""       
"anhui" 1964 "GOV" "黄岩"    "1955-03" ""       
"anhui" 1964 "GS"  "李葆华" "1962-02" ""       
"anhui" 1965 "GS"  "李葆华" "1962-02" ""       
"anhui" 1965 "GOV" "黄岩"    "1955-03" ""       
"anhui" 1966 "GS"  "李葆华" "1962-02" ""       
"anhui" 1966 "GOV" "黄岩"    "1955-03" ""       
"anhui" 1967 "GS"  "李葆华" "1962-02" "1967-01"
"anhui" 1967 "GOV" "黄岩"    "1955-03" ""       
"anhui" 1968 "GOV" "黄岩"    "1955-03" "1968-04"
"anhui" 1968 "GOV" "李德生" "1968-04" ""       
"anhui" 1969 "GOV" "李德生" "1968-04" ""       
"anhui" 1970 "GOV" "李德生" "1968-04" ""       
"anhui" 1971 "GOV" "李德生" "1968-04" ""       
"anhui" 1971 "GS"  "李德生" "1971-01" ""       
"anhui" 1972 "GOV" "李德生" "1968-04" ""       
"anhui" 1972 "GS"  "李德生" "1971-01" ""       
"anhui" 1973 "GOV" "李德生" "1968-04" ""       
"anhui" 1973 "GS"  "李德生" "1971-01" ""       
"anhui" 1974 "GOV" "宋佩璋" "1974-12" ""       
"anhui" 1974 "GS"  "李德生" "1971-01" "1974-12"
"anhui" 1974 "GOV" "李德生" "1968-04" "1974-12"
"anhui" 1975 "GS"  "宋佩璋" "1975-05" ""       
"anhui" 1975 "GOV" "宋佩璋" "1974-12" ""       
"anhui" 1976 "GS"  "宋佩璋" "1975-05" ""       
"anhui" 1976 "GOV" "宋佩璋" "1974-12" ""       
"anhui" 1977 "GOV" "宋佩璋" "1974-12" ""       
"anhui" 1977 "GS"  "宋佩璋" "1975-05" "1977-06"
"anhui" 1977 "GS"  "万里"    "1977-06" ""       
"anhui" 1978 "GOV" "万里"    "1978-01" ""       
"anhui" 1978 "GS"  "万里"    "1977-06" ""       
"anhui" 1978 "GOV" "宋佩璋" "1974-12" "1978-01"
"anhui" 1979 "GS"  "万里"    "1977-06" ""       
"anhui" 1979 "GOV" "万里"    "1978-01" "1979-12"
"anhui" 1979 "GOV" "张劲夫" "1979-12" ""       
"anhui" 1980 "GS"  "万里"    "1977-06" "1980-03"
"anhui" 1980 "GS"  "张劲夫" "1980-03" ""       
"anhui" 1980 "GOV" "张劲夫" "1979-12" ""       
"anhui" 1981 "GS"  "张劲夫" "1980-03" ""       
"anhui" 1981 "GOV" "周子健" "1981-03" ""       
"anhui" 1981 "GOV" "张劲夫" "1979-12" "1981-03"
"anhui" 1982 "GOV" "周子健" "1981-03" ""       
"anhui" 1982 "GS"  "张劲夫" "1980-03" "1982-04"
"anhui" 1982 "GS"  "周子健" "1982-04" ""       
"anhui" 1983 "GS"  "黄璜"    "1983-03" ""       
"anhui" 1983 "GOV" "王郁昭" "1983-04" ""       
"anhui" 1983 "GS"  "周子健" "1982-04" "1983-03"
"anhui" 1983 "GOV" "周子健" "1981-03" "1983-04"
"anhui" 1984 "GS"  "黄璜"    "1983-03" ""       
"anhui" 1984 "GOV" "王郁昭" "1983-04" ""       
"anhui" 1985 "GS"  "黄璜"    "1983-03" ""       
"anhui" 1985 "GOV" "王郁昭" "1983-04" ""       
"anhui" 1986 "GS"  "李贵鲜" "1986-04" ""       
"anhui" 1986 "GOV" "王郁昭" "1983-04" ""       
"anhui" 1986 "GS"  "黄璜"    "1983-03" "1986-04"
"anhui" 1987 "GS"  "李贵鲜" "1986-04" ""       
"anhui" 1987 "GOV" "王郁昭" "1983-04" "1987-06"
"anhui" 1987 "GOV" "卢荣景" "1987-06" ""       
"anhui" 1988 "GS"  "李贵鲜" "1986-04" "1988-04"
"anhui" 1988 "GOV" "卢荣景" "1988-02" ""       
"anhui" 1988 "GOV" "卢荣景" "1987-06" "1988-02"
"anhui" 1988 "GS"  "卢荣景" "1988-04" ""       
"anhui" 1989 "GS"  "卢荣景" "1988-04" ""       
"anhui" 1989 "GOV" "卢荣景" "1988-02" "1989-04"
"anhui" 1989 "GOV" "傅锡寿" "1989-04" ""       
"anhui" 1990 "GS"  "卢荣景" "1988-04" ""       
"anhui" 1990 "GOV" "傅锡寿" "1989-04" ""       
"anhui" 1991 "GS"  "卢荣景" "1988-04" ""       
"anhui" 1991 "GOV" "傅锡寿" "1989-04" ""       
"anhui" 1992 "GOV" "傅锡寿" "1989-04" ""       
"anhui" 1992 "GS"  "卢荣景" "1988-04" ""       
"anhui" 1993 "GS"  "卢荣景" "1988-04" ""       
"anhui" 1993 "GOV" "傅锡寿" "1989-04" ""       
"anhui" 1994 "GOV" "回良玉" "1994-12" ""       
"anhui" 1994 "GS"  "卢荣景" "1988-04" ""       
end