R：跟蹤因子向量/數據幀中的缺失值

我在R中有一個包含一列因子的數據幀。該列完全空白，但不包含任何NA值。當我嘗試訪問某個列的元素時，它確實顯示了一些因子級別。R：跟蹤因子向量/數據幀中的缺失值

我想識別這種類型的缺失數據並將其刪除。我怎麼做？

這是我的數據框的副本。第二列說明我的問題：

> dput(effective_data) 
structure(list(`Not this column` = structure(c(2L, 2L, 2L, 2L, 
2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 
2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 
2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 
2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 
2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 
2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 
2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 
2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 2L, 
2L, 2L), .Label = c("", "unavailable"), class = "factor"), `This column` = structure(c(1L, 
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 
1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 1L, 
1L, 1L, 1L, 1L, 1L), .Label = c("", "EVENT_VALUE_INTRA_ENB (1)", 
"EVENT_VALUE_X2 (2)"), class = "factor")), .Names = c("Not this column", 
"This column"), class = "data.frame", row.names = c(NA, -134L 
))

來源

2017-09-06 Kots

我已經將您的示例數據集添加到問題。當你想與SO上的其他人共享可複製格式的數據時，使用命令'dput（<數據集對象的名稱>）'。任何人都可以採取這樣的結果，並得到完全相同的數據，給你的問題。您可以在這裏閱讀有關最佳實踐的更多信息：https://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example –

您可以嘗試

effective_date[, !apply(effective_date,2,function(x) any(unique(x)==""))]

解釋

通過列迭代，apply(..,2,..)，尋找any列，其中unique(x) == ""

apply(effective_date,2,function(x) any(unique(x)=="")) 
# Not this column  This column 
#   FALSE   TRUE

然後子集數據框與邏輯

effective_date[ , <logical>]

來源

2017-09-06 16:08:33 CPak

R：跟蹤因子向量/數據幀中的缺失值

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