我的数据如下：
gvkey datadate fyear cusip curcd at ceq csho dltt dvc nopi oibdp
1: 1001 12/31/1981 1981 000165100 USD NA NA NA NA NA NA NA
2: 1001 12/31/1982 1982 000165100 USD NA NA NA NA NA NA NA
3: 1001 12/31/1983 1983 000165100 USD 14.080 7.823 3.568 4.344 0.000 0.640 2.650
4: 1001 12/31/1984 1984 000165100 USD 16.267 8.962 3.568 4.181 0.000 0.575 3.208
5: 1001 12/31/1985 1985 000165100 USD 39.495 13.014 3.988 11.908 0.000 0.623 7.247
6: 1003 12/31/1981 1981 000354100 USD NA NA NA NA NA NA NA
7: 1003 12/31/1982 1982 000354100 USD 5.632 1.983 2.100 1.200 0.000 0.000 1.906
8: 1003 12/31/1983 1983 000354100 USD 8.529 6.095 2.683 0.950 0.000 0.000 2.138
9: 1003 12/31/1984 1984 000354100 USD 8.241 6.482 2.683 0.600 0.000 0.000 0.825
10: 1003 01/31/1986 1985 000354100 USD 13.990 6.665 2.683 4.682 0.000 0.000 1.037
11: 1003 01/31/1987 1986 000354100 USD 14.586 7.458 2.683 3.750 0.000 0.000 2.462
12: 1003 01/31/1988 1987 000354100 USD 16.042 7.643 2.683 5.478 0.000 0.000 0.111
13: 1003 01/31/1989 1988 000354100 USD 16.280 -0.194 2.683 0.104 0.000 0.000 -3.680
14: 1003 01/31/1990 1989 000354100 USD 10.109 -0.416 2.683 0.076 0.000 0.000 -1.532
15: 1004 05/31/1981 1980 000361105 USD 83.075 29.721 2.566 23.400 1.019 0.464 11.058
16: 1004 05/31/1982 1981 000361105 USD 113.653 42.423 3.942 29.412 1.582 -0.088 12.652
17: 1004 05/31/1983 1982 000361105 USD 111.288 43.225 3.932 23.504 1.727 0.000 13.174
18: 1004 05/31/1984 1983 000361105 USD 137.228 81.085 6.007 13.040 1.965 0.522 15.208
19: 1004 05/31/1985 1984 000361105 USD 155.405 87.385 6.036 16.415 2.893 0.387 21.398
20: 1004 05/31/1986 1985 000361105 USD 198.287 95.381 9.099 25.022 3.700 1.132 27.282
prstkc pstkrv prcc_c
1: NA NA NA
2: NA NA NA
3: 0.000 0.0 7.250
4: 0.000 0.0 3.750
5: 0.009 0.0 10.125
6: NA NA NA
7: 0.000 1.2 NA
8: 1.200 0.0 5.250
9: 0.000 0.0 2.750
10: 0.000 0.0 4.375
11: 0.000 0.0 4.250
12: 0.000 0.0 2.750
13: 0.000 0.0 1.750
14: 0.000 0.0 0.750
15: 0.000 0.0 13.625
16: 0.518 0.0 7.625
17: 0.211 0.0 9.375
18: 0.003 0.0 17.250
19: 0.000 0.0 18.500
20: 0.000 0.0 25.875
除了识别变量（gvkey，datadate，fyear，cusip和curcd）之外，我想在所有变量的5％和95％上进行winorize。具体来说，我想删除所有具有至少一个数值变量值的观察值，这些值包含在范围（0,5％）或（95％，100％）百分位数内。我想在data.table环境中这样做。