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雷达卡
State Abb Region Change
1 Alabama AL South 7.5
2 Alaska AK West 13.3
3 Arizona AZ West 24.6
4 Arkansas AR South 9.1
5 California CA West 10.0
6 Colorado CO West 16.9
7 Connecticut CT Northeast 4.9
8 Delaware DE South 14.6
10 Florida FL South 17.6
11 Georgia GA South 18.3
12 Hawaii HI West 12.3
13 Idaho ID West 21.1
14 Illinois IL North Central 3.3
15 Indiana IN North Central 6.6
16 Iowa IA North Central 4.1
17 Kansas KS North Central 6.1
18 Kentucky KY South 7.4
19 Louisiana LA South 1.4
20 Maine ME Northeast 4.2
21 Maryland MD South 9.0
22 Massachusetts MA Northeast 3.1
23 Michigan MI North Central -0.6
24 Minnesota MN North Central 7.8
25 Mississippi MS South 4.3
26 Missouri MO North Central 7.0
27 Montana MT West 9.7
28 Nebraska NE North Central 6.7
29 Nevada NV West 35.1
30 New Hampshire NH Northeast 6.5
31 New Jersey NJ Northeast 4.5
32 New Mexico NM West 13.2
33 New York NY Northeast 2.1
34 North Carolina NC South 18.5
35 North Dakota ND North Central 4.7
36 Ohio OH North Central 1.6
37 Oklahoma OK South 8.7
38 Oregon OR West 12.0
39 Pennsylvania PA Northeast 3.4
40 Rhode Island RI Northeast 0.4
41 South Carolina SC South 15.3
42 South Dakota SD North Central 7.9
43 Tennessee TN South 11.5
44 Texas TX South 20.6
45 Utah UT West 23.8
46 Vermont VT Northeast 2.8
47 Virginia VA South 13.0
48 Washington WA West 14.1
49 West Virginia WV South 2.5
50 Wisconsin WI North Central 6.0
51 Wyoming WY West 14.1
upc<-subset(uspopchange,rank(Change)>40)请问这行是什么意思？rank(Change)>40？
> upc
State Abb Region Change
3 Arizona AZ West 24.6
6 Colorado CO West 16.9
10 Florida FL South 17.6
11 Georgia GA South 18.3
13 Idaho ID West 21.1
29 Nevada NV West 35.1
34 North Carolina NC South 18.5
41 South Carolina SC South 15.3
44 Texas TX South 20.6
45 Utah UT West 23.8
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