How to replace <NA> with a number for a single factor variable in R? -


  • data: dat
  • variable: v1

  • i have tried this, did not replace "< na >" (no spaces)

    cwm$v1 <- factor(cwm$v2) replace(cwm$v1, cwm$v1=="< na >", 9)

again no spaces. gives me variable still "< na >"

the symbol <na> missing value in factor:

> factor(c("a",na,"b")) [1]    <na> b    levels: b

hence can use is.na missing values, see this:

> v1 <- factor(c("a", na,"b"))   > v1[is.na(v1)] <- 9 > v1 [1]    <na> b    levels: b warning message: in `[<-.factor`(`*tmp*`, is.na(v1), value = 9) :   invalid factor level, na generated

the reason simple: 9 not level of factor. in order done, need replacement before convert factor:

> v2 <- c("a",na,"b") > v2[is.na(v2)] <- 9 > v1 <- factor(v2) > v1 [1] 9 b levels: 9 b

now have 9 separate level. if don't want this, shouldn't use factor in first place. in case start factor, convert character first:

> v1 <- factor(c("a", na,"b")) > v1 <- as.character(v1) > v1[is.na(v1)] <- 9 > v1 [1] "a" "9" "b"

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