Generate a frequency table of missing values as raw counts and percentages.
freq.na(data, ...)The result is an object of class data.frame.
either a vector or a data frame object
if x is a data frame, the names of the variables to examine or keywords to search for such variables. See lookfor for more details.
data(hdv2003)
## Examine a single vector.
freq.na(hdv2003$qualif)
## Examine a data frame.
freq.na(hdv2003)
## Examine several variables.
freq.na(hdv2003, "nivetud", "trav.satisf")
## To see only variables with the most number of missing values
head(freq.na(hdv2003))
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