小编den*_*nin的帖子

这是数据集:

company <- c("Coca-Cola Inc.", "DF, CocaCola", 
         "COCA-COLA", "PepsiCo Inc.", "Beverages Distribution")
brand  <- c("Coca-Cola Zero","N/A", "Coca-Cola", "Pepsi", "soft drink")
vol  <- c("2456","1653", "19", "2766", "167")
data   <-data.frame(company, brand, vol)
data

结果如下:

                 company             brand    vol
1         Coca-Cola Inc.    Coca-Cola Zero   2456
2           DF, CocaCola               N/A   1653
3              COCA-COLA          CocaCola     19
4           PepsiCo Inc.             Pepsi   2766
5 Beverages Distribution        soft drink    167

比方说,这是按品牌进口量.

任务是对数据帧进行SUBSET,以仅查看与可口可乐相关的观察结果,而不是任何其他品牌.

• 问题在于可口可乐以多种不同的方式编写.
• 此外,我们知道Beverages Distribution公司只进口可口可乐,尽管上表中没有说明.

我们需要将COMPANY和BRAND变量与标准列表(键)进行部分匹配:

company_key <- c("coca-", "cocacola", "coca cola", "beverages distribution")
brand_key <- c("coca-", "cocacola", "coca …