我必须删除所有至少包含这些变量Loading Date
,year of built
,vessel type
和cargo size
之一的观测值。
anyNA(CW_data$`Loading Date`) #result is FALSE,which means there aren't missing values
anyNA(CW_data$`Year Built`) #result is TRUE,there are missing values
anyNA(CW_data$`Vessel Type`)#result is TRUE,there are missing values
anyNA(CW_data$`Cargo Size`)#result is TRUE,there are missing values
CW_data_noNA <- filter(CW_data,is.na('Year Built')==FALSE |
is.na('Vessel Type'==FALSE)|
is.na('Cargo Size')==FALSE |
is.na('Loading Date') == FALSE)
我尝试了上面的代码,但是结果数据集与原始代码相同。有人可以解释我做错了吗?非常感谢,LMC