mc_indicator: Multiple choice questions to dummy or indicator values.
In antaldaniel/surveyreader: Data cleaning and integration for survey files

Description Usage Arguments Examples

Multiple choice question options are in separate columns because the respondent can select or not select any number of them, or several combinations.

1 2	mc_indicator(column, selected = 1, unselected = 0, missing = 0, na_id = NA)

`column`	A vector containing the multiple choice answers.
`selected`	What should be the replacement value of selected columns? Defaults to `1`. In some cases this may vary from column to column.
`unselected`	Depending on your questionnaire, not selecting an answer option can have different meanings. Mostly you should substitute unselected values with `0` but in some cases `NA` may be a better option.
`missing`	Are there explicit missings in your column. Defaults to `NA`.
`na_id`	Is there a special string for explicitly missing variables? (Default: `NA` )

mc_column_1 <- c("first option", NA, "first option", "NA" )

mc_indicator ( column     = mc_column_1,
               selected   = 1,
               unselected = 0,
               missing    = 0,
               na_id      = NA)

mc_indicator ( column     = mc_column_1,
               selected   = 1,
               unselected = 0,
               missing    = 0,
               na_id      = "NA")

mc_column_2 <- c(NA, "second option", NA, "NA")

mc_indicator ( column = mc_column_2,
               selected = 2,
               missing = NA,
               na_id = "NA")