39         %macro select;
40          %*--This macro will be invoked when reading the headers data.  It should assign a value
41              of 1 to _keep to indicate that the record/observation is to be processed.  1 means
42              read the data, 0 means do not.--;
43            _keep=1;
44           if SumLev in
44       ! ('070','155','172','270','271','272','273','275','276','274','277','278','291','292','258','293','294','257',
45                 '259','382','383','384','387','388','440','450') then _keep=0;  *<======levels to skip==================;
46           %mend select;

...

56          data
57            sf32000.usgeos (sortedby=LogRecNo label='2000 Summary File 3 (SF3) Geo Headers data for National File'
58                            keep=geocode--AreaSQMI PCT)
59            sf32000.usregdiv(sortedby=LogRecNo label='Summaries for US, Regions and Divisions (SumLev 010, 020 and 030)'
59       ! compress=no)
60            sf32000.usgeocomps(sortedby=LogrecNo label='Geographic Component summaries - all applicable sumlevs')
61            sf32000.usstcnty(sortedby=LogRecNo label='State and County summaries (SumLev 040 and 050)')
62            sf32000.usplaces(sortedby=LogRecNo label='Place level summaries (SumLev 160)' )
63            sf32000.usmcds(sortedby=LogRecNo label='MCD level summaries (SumLev 060)' )
64            sf32000.uszips(sortedby=LogRecNo label='5-digit ZIP/ZCTA summaries (SumLev 860)')
65            sf32000.usuas(sortedby=LogRecNo label='Urban Areas (Urbanized Areas & Urban Clusters)')
66            sf32000.usother(sortedby=LogRecNo label='Other misc levels incl MSA, NECMA, CD106, ZIP3, UA parts, etc.');
67         

...

21876         if geocomp ne '00' then do;
21877            *--geographic components kept only for state level and above.  county, mcd components dropped.-;
21878            if sumlev le '040' then output  sf32000.usgeocomps;
21879            return;
21880            end;
21881         select(SumLev);
21882          when('010','020','030') output sf32000.usregdiv;
21883          when('040','050') output sf32000.usstcnty;
21884          when('060') output sf32000.usmcds;
21885          when('160') output sf32000.usplaces;
21886          when('860') output sf32000.uszips;
21887          when('400','410') output sf32000.usuas;
21888          otherwise do;
21889            _nother+1;   *--to keep this dataset from getting too large--------;
21890            if _nother <= 20000 then output sf32000.usother;
21891               else if mod(_nother,1000)=1 then put SumLev= _nother= ' (other summary levels being deleted***)';
21892            end;
21893          end;

...

NOTE: 487093 records were read from the infile GEOS.
      The minimum record length was 400.
      The maximum record length was 400.
NOTE: 487093 records were read from the infile IN1.
      The minimum record length was 520.
      The maximum record length was 2081.
...

NOTE: 487093 records were read from the infile IN8.
      The minimum record length was 512.
      The maximum record length was 2196.
...

NOTE: 487093 records were read from the infile IN68.
      The minimum record length was 450.
      The maximum record length was 2104.

NOTE: The data set SF32000.USGEOS has 277186 observations and 74 variables.
NOTE: Compressing data set SF32000.USGEOS decreased size by 64.51 percent. 
      Compressed is 1640 pages; un-compressed would require 4621 pages.
NOTE: The data set SF32000.USREGDIV has 14 observations and 16594 variables.
NOTE: The data set SF32000.USGEOCOMPS has 6141 observations and 16594 variables.
NOTE: Compressing data set SF32000.USGEOCOMPS decreased size by 26.87 percent. 
      Compressed is 4509 pages; un-compressed would require 6166 pages.
NOTE: The data set SF32000.USSTCNTY has 3271 observations and 16594 variables.
NOTE: Compressing data set SF32000.USSTCNTY decreased size by 5.76 percent. 
      Compressed is 3106 pages; un-compressed would require 3296 pages.
NOTE: The data set SF32000.USPLACES has 25375 observations and 16594 variables.
NOTE: Compressing data set SF32000.USPLACES decreased size by 51.85 percent. 
      Compressed is 12231 pages; un-compressed would require 25400 pages.
NOTE: The data set SF32000.USMCDS has 36351 observations and 16594 variables.
NOTE: Compressing data set SF32000.USMCDS decreased size by 55.01 percent. 
      Compressed is 16367 pages; un-compressed would require 36376 pages.
NOTE: The data set SF32000.USZIPS has 33178 observations and 16594 variables.
NOTE: Compressing data set SF32000.USZIPS decreased size by 45.59 percent. 
      Compressed is 18066 pages; un-compressed would require 33203 pages.
NOTE: The data set SF32000.USUAS has 7406 observations and 16594 variables.
NOTE: Compressing data set SF32000.USUAS decreased size by 27.87 percent. 
      Compressed is 5360 pages; un-compressed would require 7431 pages.
NOTE: The data set SF32000.USOTHER has 17886 observations and 16594 variables.
NOTE: Compressing data set SF32000.USOTHER decreased size by 41.00 percent. 
      Compressed is 10567 pages; un-compressed would require 17911 pages.
NOTE: DATA statement used:
      real time           2:07:49.88
      cpu time            2:03:08.46