Value to Impute for Missing Genotypes Use this option to specify a single value to designate the missing genotypes . The output data set contains this specified value wherever a missing value was found. If you leave this space blank, all missing values are recoded as blanks for character genotypes and periods (.) for numeric genotypes. To Specify the Value to Impute for Missing Genotypes: Enter the value in the text box. If you change your mind and would like to reset the field, click Clear .