将csv导入R，其缺失值为“ N

Question

我有一个要导入到R中的csv数据文件，但一列出现问题。

data <- read.csv("example.csv", header = F, stringsAsFactors = F, sep = ";", colClasses = c("character","character", rep("character", 2),"numeric",rep("character",6),rep("numeric",5)))

Error in scan(file = file, what = what, sep = sep, quote = quote, dec = dec,  : 
  scan() expected 'a real', got '"N' 

[我意识到这是因为一列包含缺失值，并列为“N。例如，一条有问题的数据行如下：

11e9-afea;"N;"Passenger Car";"SEDAN";"2019";"BMW";"M5";"Gas";"All Wheel Drive";"Automatic";"";"18.1512";"29.0277";"15";"17";"21"

据推测，如下所示的数据行没有问题：

11e9-afea;"4";"Passenger Car";"SEDAN";"2019";"BMW";"M5";"Gas";"All Wheel Drive";"Automatic";"";"18.1512";"29.0277";"15";"17";"21"

我该如何处理所有的“ N并正确导入数据？

谢谢！

Answer 1

您可以尝试使用read_csv中的readr功能。您可以指定要在参数"N"中将NA视为na，例如na=c("NA","","N")

read_csv(file, col_names = TRUE, col_types = NULL,
  locale = default_locale(), na = c("", "NA"), quoted_na = TRUE,
  quote = "\"", comment = "", trim_ws = TRUE, skip = 0,
  n_max = Inf, guess_max = min(1000, n_max),
  progress = show_progress(), skip_empty_rows = TRUE)