R中识别重复项的错误：我无法创建数据帧以按顺序观察重复项

我认为这一点最好的体现是所返回的内容。不幸的是，我无法创建一个可复制的示例：

> duplicates <- lu21[duplicated(lu21$id), ]
> nrow(duplicates) #demonstrating duplicates are present
[1] 61773
> duplicated_ids <- lu21[duplicated(lu21$id), ] 
> duplicated_ids %>% 
+   group_by(id) %>% 
+   arrange(id) %>% 
+   head(., 6)
# A tibble: 6 × 2
# Groups:   id [6]
       em id                               
      <dbl> <chr>                            
1 700400662 10000334_313317_1188902_1_2014.5 
2 200400166 10000446_367698_1046385_1_2014
3 200600162 10000846_504520_872256_1_2006