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#NULL value is declared as one of the two values of a binominal attribute
I import my data and at the "Format your columns" step , on some binominal variables with values 0 or 1 there are missing values. These missing values are parsed as #NULL in this step and the attribute is declared as polynominal . When i try to change the attribute's type back to binominal , #NULL is one of the two values and the 0 or 1 is declared as a missing value noted with "?" .
How i can declare #NULL as missing value in binominal type attribute?
Thank you for your time