* Example generated by -dataex-. To install: ssc install dataex
clear
input str6 Stkcd str10(Rptdt Fenddt) str134 AnanmID float(forecastterm super_pre group)
"000538" "2008-04-09" "2008-12-31" "30000000000000009207" 1 0 14
"000538" "2008-04-28" "2008-12-31" "30000000000000009207" 1 0 14
"000538" "2008-05-20" "2008-12-31" "30000000000000009207" 1 0 14
"000538" "2008-08-12" "2008-12-31" "30000000000000009207" 1 0 14
"000538" "2008-08-28" "2008-12-31" "30000000000000009207" 1 0 14
"000538" "2008-10-24" "2008-12-31" "30000000000000009207" 1 1 14
"000538" "2007-05-19" "2008-12-31" "30000000000000009207" 2 0 15
"000538" "2007-10-26" "2008-12-31" "30000000000000009207" 2 0 15
"000538" "2009-05-18" "2009-12-31" "30000000000000009207" 1 0 16
"000538" "2008-04-09" "2009-12-31" "30000000000000009207" 2 1 17
"000538" "2008-04-28" "2009-12-31" "30000000000000009207" 2 1 17
"000538" "2008-05-20" "2009-12-31" "30000000000000009207" 2 1 17
"000538" "2008-08-12" "2009-12-31" "30000000000000009207" 2 1 17
"000538" "2008-08-28" "2009-12-31" "30000000000000009207" 2 1 17
"000538" "2008-10-24" "2009-12-31" "30000000000000009207" 2 1 17
end


想请问如何求   在同一group,以某一时点往前一年内，有多少个连续的super_pre==1，将其生成一个新的变量
感谢！！