The proc format is shown below, and the _IMPCTY is the county variable in a dataset determining the smoking rates by county in a state. proc format; value _IMPCTY 1   =   'Albany' 3   =   'Allegany' 5   =   'Bronx' 7   =   'Broome' 9   =   'Cattaraugus' 11   =   'Cayuga' 13   =   'Chautauqua' 15   =   'Chemung' 17   =   'Chenango' 19   =   'Clinton' 21   =   'Columbia' 23   =   'Cortland' 25   =   'Delaware' 27   =   'Dutchess' 29   =   'Erie' 31   =   'Essex' 33   =   'Franklin' 35   =   'Fulton' 37   =   'Genesee' 39   =   'Greene' 41   =   'Hamilton' 43   =   'Herkimer' 45   =   'Jefferson' 47   =   'Kings' 49   =   'Lewis' 51   =   'Livingston' 53   =   'Madison' 55   =   'Monroe' 57   =   'Montgomery' 59   =   'Nassau' 61   =   'New York' 63   =   'Niagara' 65   =   'Oneida' 67   =   'Onondaga' 69   =   'Ontario' 71   =   'Orange' 73   =   'Orleans' 75   =   'Oswego' 77   =   'Otsego' 79   =   'Putnam' 81   =   'Queens' 83   =   'Rensselaer' 85   =   'Richmond' 87   =   'Rockland' 89   =   'St. Lawrence' 91   =   'Saratoga' 93   =   'Schenectady' 95   =   'Schoharie' 97   =   'Schuyler' ... View more

The raw values stored in _IMPCTY are county names, while the IMPCTY is defined in PROC FORMAT as:  FORMAT  _IMPCTY _IMPCTY.; this is the entire last statement in the code: proc surveyfreq data=b2021 nomcar; /*Adult current smoking by county*/      strata _ststr;      weight  _llcpwt_trimmed_county; *use county weight;           tables _IMPCTY*_rfsmok3/ row cl;      FORMAT  _IMPCTY _IMPCTY.;  run; ... View more