Some features may have the same value for all rows depending on the way you perform a subset. In these cases, this feature is not adding information to the analysis and therefore should be removed. This function helps you to find such features and provides you also the unique value of such a feature.
The dataframe with SEER data
You can provide the return$'Unique value' of this function as the argument
removeFullNAFeatures function for even if an unique value for
a feature is also a value in another feature, it will only be removed if it
is the only valeu for all rows for this specific feature.
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