我用bys year investor_1 investor_2: gen freq=_N只能生成当年出现的次数。
如下列数据中1997年摩根士丹利对应investor_2为高盛的情况在1997年及之前出现了两次,频数则为2
又如1995年华晶对应investor_2为高盛的情况在1995年及之前出现了一次,频数则为1
感激不尽!
附上相关数据:
- * Example generated by -dataex-. To install: ssc install dataex
- clear
- input str4 year str50(investor_1 investor_2)
- "1993" "摩根士丹利" "高盛"
- "1993" "高盛" "摩根士丹利"
- "1994" "广东科创投" "广东科风投"
- "1994" "广东科风投" "广东科创投"
- "1994" "第一东方" ""
- "1994" "第一东方" ""
- "1995" "AIG Asian Infrastructure Fund (Asia I)" "新加坡ZF投资"
- "1995" "Alpine Technology Ventures" "Institutional VC"
- "1995" "Chase Manhattan Capital" "Flatiron Partners"
- "1995" "Chase Manhattan Capital" "华晶"
- "1995" "Chase Manhattan Capital" "经济发展局投资"
- "1995" "Chase Manhattan Capital" "高盛"
- "1995" "Flatiron Partners" "Chase Manhattan Capital"
- "1995" "Flatiron Partners" "华晶"
- "1995" "Flatiron Partners" "经济发展局投资"
- "1995" "Flatiron Partners" "高盛"
- "1995" "Institutional VC" "Alpine Technology Ventures"
- "1995" "华晶" "Chase Manhattan Capital"
- "1995" "华晶" "Flatiron Partners"
- "1995" "华晶" "经济发展局投资"
- "1995" "华晶" "高盛"
- "1995" "华登国际" "国泰财富"
- "1995" "国泰财富" "华登国际"
- "1995" "摩根士丹利" "新加坡ZF投资"
- "1995" "新加坡ZF投资" "AIG Asian Infrastructure Fund (Asia I)"
- "1995" "新加坡ZF投资" "摩根士丹利"
- "1995" "经济发展局投资" "Chase Manhattan Capital"
- "1995" "经济发展局投资" "Flatiron Partners"
- "1995" "经济发展局投资" "华晶"
- "1995" "经济发展局投资" "高盛"
- "1995" "高盛" "Chase Manhattan Capital"
- "1995" "高盛" "Flatiron Partners"
- "1995" "高盛" "华晶"
- "1995" "高盛" "经济发展局投资"
- "1996" "Edward Robert" "Nicholas Negroponte"
- "1996" "Nicholas Negroponte" "Edward Robert"
- "1996" "Transpac Industrial" "汇亚"
- "1996" "汇亚" "Transpac Industrial"
- "1997" "Crosslink Technology" "华登国际"
- "1997" "Crosslink Technology" "怡和创投"
- "1997" "IDG资本" "中经合"
- "1997" "Warburg Pincus Ventures" "Warburg Pincus Ventures International"
- "1997" "Warburg Pincus Ventures" "中投IV期基金"
- "1997" "Warburg Pincus Ventures" "斯道资本"
- "1997" "Warburg Pincus Ventures International" "Warburg Pincus Ventures"
- "1997" "Warburg Pincus Ventures International" "中投IV期基金"
- "1997" "Warburg Pincus Ventures International" "斯道资本"
- "1997" "中投IV期基金" "Warburg Pincus Ventures"
- "1997" "中投IV期基金" "Warburg Pincus Ventures International"
- "1997" "中投IV期基金" "斯道资本"
- "1997" "中经合" "IDG资本"
- "1997" "华登国际" "Crosslink Technology"
- "1997" "华登国际" "怡和创投"
- "1997" "怡和创投" "Crosslink Technology"
- "1997" "怡和创投" "华登国际"
- "1997" "摩根士丹利" "高盛"
- "1997" "斯道资本" "Warburg Pincus Ventures"
- "1997" "斯道资本" "Warburg Pincus Ventures International"
- "1997" "斯道资本" "中投IV期基金"
- "1997" "汇睿资本" "汉鼎亚太"
- "1997" "汉鼎亚太" "汇睿资本"
- "1997" "高盛" "摩根士丹利"
- "1998" "IDG资本" "晨兴"
- "1998" "IDG资本" "英特尔投资"
- "1998" "上海信投" "投资者"
- "1998" "上海信投" "投资者"
- "1998" "上海信投" "联和投资"
- "1998" "中金公司" "新加坡ZF投资"
- "1998" "中金公司" "银瑞达"
- "1998" "亚太成长基金II" "亚太成长基金III"
- "1998" "亚太成长基金III" "亚太成长基金II"
- "1998" "投资者" ""
- "1998" "投资者" ""
- "1998" "投资者" ""
- "1998" "投资者" ""
- "1998" "投资者" "上海信投"
- "1998" "投资者" "联和投资"
- "1998" "新加坡ZF投资" "中金公司"
- "1998" "新加坡ZF投资" "银瑞达"
- "1998" "晨兴" "IDG资本"
- "1998" "晨兴" "英特尔投资"
- "1998" "江苏苏高新" "江苏高科投"
- "1998" "江苏高科投" "江苏苏高新"
- "1998" "联和投资" "上海信投"
- "1998" "联和投资" "投资者"
- "1998" "联和投资" "投资者"
- "1998" "英特尔投资" "IDG资本"
- "1998" "英特尔投资" "晨兴"
- "1998" "银瑞达" "中金公司"
- "1998" "银瑞达" "新加坡ZF投资"
- "1998" "集富亚洲" ""
- "1998" "集富亚洲" ""
- "1998" "集富亚洲" ""
- "1998" "集富亚洲" ""
- "1998" "集富亚洲" ""
- "1998" "集富亚洲" ""
- "1999" "Alpine Technology Ventures" "Altos Ventures"
- "1999" "Alpine Technology Ventures" "JK&B Capital"
- "1999" "Alpine Technology Ventures" "MK Global Ventures"
- "1999" "Alpine Technology Ventures" "中经合"
- "1999" "Alpine Technology Ventures" "英特尔投资"
- "1999" "Altos Ventures" "Alpine Technology Ventures"
- "1999" "Altos Ventures" "JK&B Capital"
- "1999" "Altos Ventures" "MK Global Ventures"
- "1999" "Altos Ventures" "中经合"
- "1999" "Altos Ventures" "英特尔投资"
- "1999" "CCMP Capital" "富国"
- "1999" "Celtic House" "IDG资本"
- "1999" "Celtic House" "旭扬创投"
- "1999" "China Walden Venture Investments Ltd." "GIC特殊投资"
- "1999" "China Walden Venture Investments Ltd." "PacVen Walden Ventures III"
- "1999" "China Walden Venture Investments Ltd." "中金公司"
- "1999" "Crosslink Technology" "上海永宣"
- "1999" "Crosslink Technology" "华晶"
- "1999" "Crosslink Technology" "华登国际"
- "1999" "Crosslink Technology" "华登国际"
- "1999" "Crosslink Technology" "经济发展局投资"
- "1999" "Crosslink Technology" "软银中国资本"
- "1999" "Crosslink Technology" "高盛"
- "1999" "GIC特殊投资" "China Walden Venture Investments Ltd."
- "1999" "GIC特殊投资" "PacVen Walden Ventures III"
- "1999" "GIC特殊投资" "中金公司"
- "1999" "IDG资本" "Celtic House"
- "1999" "IDG资本" "兰馨亚洲"
- "1999" "IDG资本" "启峰"
- "1999" "IDG资本" "嘉丰资本"
- "1999" "IDG资本" "投资者"
- "1999" "IDG资本" "旭扬创投"
- "1999" "IDG资本" "深创投"
- "1999" "IDG资本" "深港产学研"
- "1999" "IDG资本" "英特尔投资"
- "1999" "IDG资本" "薛蛮子(薛必群)"
- "1999" "JK&B Capital" "Alpine Technology Ventures"
- "1999" "JK&B Capital" "Altos Ventures"
- "1999" "JK&B Capital" "MK Global Ventures"
- "1999" "JK&B Capital" "中经合"
- "1999" "JK&B Capital" "英特尔投资"
- "1999" "KTB" "华登国际"
- "1999" "KTB" "日亚投资"
- "1999" "MK Global Ventures" "Alpine Technology Ventures"
- "1999" "MK Global Ventures" "Altos Ventures"
- "1999" "MK Global Ventures" "JK&B Capital"
- "1999" "MK Global Ventures" "中经合"
- "1999" "MK Global Ventures" "英特尔投资"
- "1999" "Mobius" "Trans Cosmos"
- "1999" "PacVen Walden Ventures III" "China Walden Venture Investments Ltd."
- "1999" "PacVen Walden Ventures III" "GIC特殊投资"
- "1999" "PacVen Walden Ventures III" "中金公司"
- "1999" "Seligman" "德丰杰"
- "1999" "Trans Cosmos" "Mobius"
- end
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