求解答!我想保留重复值里的最后一个,应该怎样实现?部分面板数据如下:
Scode jidu GR ROA TOA MNI
2 2006q4 1.6917 .1885 8.975
2 2007q1 78.575 1.241 .0834 14.884
2 2007q2 59.9319 1.8545 .1227 15.1188
2 2007q3 67.3176 .3137 .0388 8.0888
2 2007q4 126.9287 3.0005 .2189 13.7092
2 2007q4 126.9287 2.9246 .2133 13.7092
2 2008q1 55.5717 .6967 .0621 11.2201
2 2008q2 55.4566 1.2368 .1 12.3719
2 2008q3 71.823 .1853 .0455 4.0758
2 2008q4 -13.5965 1.4596 .1533 9.5211
2 2008q4 -13.5965 1.4732 .1547 9.5211
2 2009q1 27.5588 .63 .0669 9.4161
2 2009q2 25.7012 1.4081 .1094 12.8671
2 2009q3 46.3085 .3411 .0609 5.6004
2 2009q4 4.8093 1.7761 .1448 12.2673
2 2009q4 4.8093 1.7238 .1405 12.2673
2 2010q1 -8.076 .7878 .0525 15.0111
2 2010q2 -32.123 1.0915 .06 18.2038
2 2010q3 -27.4213 .2637 .0322 8.1848
2 2010q4 46.5231 1.9878 .1404 14.1569
2 2010q4 46.5231 1.8601 .1314 14.1569
2 2011q1 6.1997 .5344 .0353 15.1205
2 2011q2 29.7712 .7143 .0484 14.7498