df_explicit_na.md
In tern: Create Common TLGs Used in Clinical Trials

Default fill in of missing values and conversion to factor works as expected

Code
  res
Output
    v1        v2        v3 v4        v5        v6 v7    v8
  1  A         A         A  D         A         A  1  TRUE
  2  B         B         B  E         B         B  2 FALSE
  3  A         A         A  F <Missing> <Missing>  3    NA
  4  B <Missing> <Missing>  E         C         C  4    NA

Code
  res
Output
  $v1
  [1] "B" "A"

  $v2
  [1] "B"         "A"         "<Missing>"

  $v3
  [1] "B"         "A"         "<Missing>"

  $v4
  [1] "D" "E" "F"

  $v5
  [1] "A"         "B"         "C"         "<Missing>"

  $v6
  [1] "A"         "B"         "C"         "<Missing>"

  $v7
  NULL

  $v8
  NULL

Default settings work when input data does not have labels

Code
  res
Output
    v1        v2        v3 v4        v5        v6 v7    v8
  1  A         A         A  D         A         A  1  TRUE
  2  B         B         B  E         B         B  2 FALSE
  3  A         A         A  F <Missing> <Missing>  3    NA
  4  B <Missing> <Missing>  E         C         C  4    NA

Only replace missing values without modifying character or logical variables

Code
  res
Output
    v1        v2        v3 v4        v5        v6 v7    v8
  1  A         A         A  D         A         A  1  TRUE
  2  B         B         B  E         B         B  2 FALSE
  3  A         A         A  F <Missing> <Missing>  3    NA
  4  B <Missing> <Missing>  E         C         C  4    NA

Conversion to factor works with some variables omitted

Code
  res
Output
    v1   v2        v3 v4        v5 v6 v7        v8
  1  A    A         A  D         A  A  1      TRUE
  2  B    B         B  E         B  B  2     FALSE
  3  A    A         A  F <Missing>     3 <Missing>
  4  B <NA> <Missing>  E         C  C  4 <Missing>

Only convert logical variables but not character variables

Code
  res
Output
    v1        v2        v3 v4        v5        v6 v7        v8
  1  A         A         A  D         A         A  1      TRUE
  2  B         B         B  E         B         B  2     FALSE
  3  A         A         A  F <Missing> <Missing>  3 <Missing>
  4  B <Missing> <Missing>  E         C         C  4 <Missing>