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2013 Jun 07
4
matched samples, dataframe, panel data
...e #same, it could vary in an interval of +/- 10%, for example) #My reproducible example firm1<-sort(rep(1:10,5),decreasing=F) year1<-rep(2000:2004,10) industry1<-rep(20,50) dummy1<-c(0,0,1,1,0,0,1,1,0,1,1,1,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,1,0,1,0,1,1,1,1,1,0,0,1,0,0,0,0,0,1,1,1) dimension1<-c(2120,345,2341,5678,10900,4890,2789,3412,9500,8765,4532,6593,12900,123,2345,3178,2678,6666,647,23789, 2189,4289,8543,637,23456,781,35489,2345,5754,8976,3245,1234,25,1200,2345,2765,389,23456,2367,3892,5438,37824, 23,2897,3456,7690,6022,3678,9431,2890) data1<-data.frame(firm1,year1,industry1,...