group_by 并总结 tidyverse package 在 r 中的用法

Question

I am analyzing the COVID-19 data in r and I want to get the aggregate result of total case in different continent.

total_cases_continent <- covid_data %>% 
select(continent, new_cases) %>% 
group_by(continent) %>% 
summarize(total_cases = sum(new_cases))

I get this result below, instead of present total cases in different continent, this only shows total cases in different continent in one row

Answer 1

It looks like there might be some issues with the values of your variable "continent". I would recommend checking the class of the variable, as well as making sure all of the values are what you expected them to be. This is probably causing the issues within your group_by statement.