Categorical variables only allow a set of values to appear in the variable . Due to various reasons, a categorical variable may contain values that are not standard. The allowed values can be set in the YAML configuration while initialising the ccTable (see ccTable-class, create_cctable). In the following example, we can see how to set up the categorical filter for the variable dead_icu (NIHR_HIC_ICU_0097) which only allows its value to be A, D, E.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | ## Not run:
# Example for categorical filter setup in the YAML configuration
NIHR_HIC_ICU_0097:
category:
levels:
A: Alive
D: Dead
E: Alive - not discharged
apply: drop_entry
# Run the filter on ccTable ct
ct$filter_categories() # run the filter
ct$apply_filters() # apply the filter and create the clean table
## End(Not run)
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