The following statements are available in PROC HTSNP.
                         PROC HTSNP
                          <options>   ; 
                         BY
                          variables   ; 
                         FREQ
                          variable   ; 
                         VAR
                          variables   ; 
            
Items within angle brackets (< >) are optional, and statements following the PROC HTSNP statement can appear in any order. Only the VAR statement is required.