Preparing Input Phenotype Files for EMMAX

Question

[yifan wang]

The wiki(http://genome.sph.umich.edu/wiki/EMMAX)says preparing input Phenotype files, reformat the phenotype files in the same order of .tfam files and three entries at each line, FAMID, INDID, and phenotype values. Missing phenotype values should be represented as "NA". but i have no idea how to reformat this？