数据如下:我希望得到宽数据:把贸易量按照国家来分解成各国贸易量变量。
但是装换出现错误,报告国家变量中含缺失值,但是数据并未发现缺失值,
这是什么原因,该如何解决?
. reshape wide tradevalueus,i(year commoditycode) j(reporter_num)
variable reporter_num contains missing values
year commoditycode reporter_num tradevalueus
2009 4 Afghanistan 157494
2008 20 Afghanistan 1.4e+06
2009 5 Afghanistan 132727
2009 12 Afghanistan 4.1e+07
2008 9 Afghanistan 1.8e+06
2008 7 Afghanistan 3.4e+06
2009 51 Afghanistan 7.9e+06
2009 8 Afghanistan 2.0e+08