R语言初学者求助：Divvy共享单车项目NA值无法清除问题

我是R语言初学者，在Divvy共享单车出行数据分析的毕业项目中遇到问题：使用na.omit()和drop_na()等代码去除NA值后，计算MIN值仍无结果，图表中仍存在NA值。

相关代码 #

聚合统计ride_length的代码 #

aggregate(all_trips_v2$ride_length ~ all_trips_v2$member_casual, FUN = mean)
aggregate(all_trips_v2$ride_length ~ all_trips_v2$member_casual, FUN = median)
aggregate(all_trips_v2$ride_length ~ all_trips_v2$member_casual, FUN = max)
aggregate(all_trips_v2$ride_length ~ all_trips_v2$member_casual, FUN = min)

按用户类型和星期分组统计的代码 #

all_trips_v2 %>% 
  mutate(weekday = wday(started_at, label = TRUE)) %>% 
  group_by(member_casual, weekday) %>% 
  summarise(number_of_rides = n(),average_duration = mean(ride_length)) %>% 
  arrange(member_casual,weekday)

我尝试使用na.omit()和print(df %>% drop_na())代码清除NA值，但均未生效。

内容的提问来源于stack exchange，提问作者innocent sky