ChooseFunction ChooseFunctionDescription HasChangedFunction HasChangedFunctionDescription InformationFunctionCategory IsBlankFunction IsBlankFunctionDescription IsErrFunction IsErrFunctionDescription IsErrorFunction IsErrorFunctionDescription IsEvenFunction IsEvenFunctionDescription IsLogicalFunction IsLogicalFunctionDescription IsNaFunction IsNaFunctionDescription IsNonTextFunction IsNonTextFunctionDescription IsNumberFunction IsNumberFunctionDescription IsOddFunction IsOddFunctionDescription IsRefFunction IsRefFunctionDescription IsTextFunction IsTextFunctionDescription NaFunction NaFunctionDescription