我有一个数据框,我希望通过随机选择基于ID的spp == cat25个ID和基于ID的25个ID来进行子集化spp == dog.
这是我的示例数据:
ID spp category prop
1 cat small_mam 0.99
2 cat small_mam 0.8
2 cat birds 0.15
3 dog large_mam 1
4 dog med_mam 0.4
4 dog emu 0.6
10 dog med_mam 0.8
10 dog birds 0.2
12 dog reptiles 1
13 dog large_mam 1
14 dog large_mam 1
15 dog large_mam 1
27 cat birds 0.2
28 cat small_mam 1
29 cat small_mam 0.75
29 cat birds 0.25
30 cat …