标签: r statistics
如何删除参与者回答“加拿大”为出生国的数据框中的行?
data <- data.frame(ID = c(1, 2, 3, 4, 5), COB = c("China", "Russia", "Canada", "Canada", "Sweden") ) data ID COB 1 China 2 Russia 3 Canada 4 Canada 5 Sweden