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SAS imports missing data as empty strings or strings with whitespaces only. This helper function can be used to
convert these values to NAs.
Usage
sas_na(x, empty = TRUE, whitespaces = TRUE)
Arguments
- x
(factor or character)
values for which any missing values should be substituted.
- empty
(flag)
if TRUE, empty strings get replaced by NA.
- whitespaces
(flag)
if TRUE, strings made from only whitespaces get replaced with NA.
Value
x with "" and/or whitespace-only values substituted by NA, depending on the values of
empty and whitespaces.
Examples
sas_na(c("1", "", " ", " ", "b"))
#> [1] "1" NA NA NA "b"
sas_na(factor(c("", " ", "b")))
#> [1] <NA> <NA> b
#> Levels: b
is.na(sas_na(c("1", "", " ", " ", "b")))
#> [1] FALSE TRUE TRUE TRUE FALSE
