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# Missing data can be represented with empty cells or whitespace-only cells.
# Test that values used to represent missing data in other programs
# (e.g. pandas) are not treated as missing (e.g. "NA", "N/A"). Also test
# columns that consist solely of missing data. By default, an empty column will
# be treated as numeric data (column "NA" in this example). "col4" overrides
# this behavior to make its empty column categorical.
id col1 NA col3 col4
#q2:types categorical
None 1 null
nan N/A
NA " " NA
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