Merrill et al., LOOK-UP, D-Lib Magazine (March 1996)

Table 1. Data files and geographic levels in LOOKUP

For each data file and geographic level are indicated the number of geographic areas (rows), the number of data variables (columns), and the number of data values (rows times columns). CDs and GB are the number of CD-ROMs and gigabytes (billions of characters), respectively. Numbers of census tracts, block groups, and ZIP codes are estimates. Data for Puerto Rico and outlying areas are not available. LOOKUP provides almost two billion numeric data values, obtained from 86 CD-ROMs.


STF1: Summary Tape File 1. 100% (complete count) data: 610 variables in 98 tables. Tables P12 and P13 are not available.
  
file 	geographic level	  rows	columns	   data	values   CDs   GB  
						    (millions)  
  
STF1A	states (and DC)		    51	    610	         0.03  
STF1A	  counties		  3141	    610	         1.9  
STF1A	    census tracts	 60000	    610	        40  
STF1A	      block groups	200000	    610	       120  
STF1A	    county subdivisions	 34298	    610	        21  
STF1A	      places/remainders	 59619	    610	        36  
STF1A	        census tracts	 70000	    610	        43  
STF1A	  places		 23435	    610	        14  
STF1A	    counties		 24437	    610	        15  
STF1A	total			470000	    610	       290        17  8.5  
  
STF1C	nation			     1	    610	         0.001  
STF1C	states (and DC)		    51	    610	         0.03  
STF1C	  counties		  3141	    610	         1.9  
STF1C	metr stat areas		   284	    610	         0.17  
STF1C	total			  3477	    610	         2.1       1  0.5  
  
STF1D	103rd Congress districts   435	    610		 0.3       1  0.5  
STF1D	104rd Congress districts   435	    610		 0.3       1  0.5  

STF3: Summary Tape File 3. Sample data: 3347 variables in 292 tables.

  
file 	geographic level	  rows	columns	   data	values   CDs   GB  
						    (millions)  
  
STF3A	states (and DC)		    51	   3347	         0.2  
STF3A	  counties		  3141	   3347	        11  
STF3A	    census tracts	 60000	   3347	       200  
STF3A	      block groups	200000	   3347	       700  
STF3A	    county subdivisions	 34298	   3347	       110  
STF3A	      places/remainders	 59619	   3347	       120  
STF3A	        census tracts	 70000	   3347	       230  
STF3A	  places		 23435	   3347	        80  
STF3A	    counties		 24437	   3347	        80  
STF3A	total			470000	   3347	      1500        62   31  
  
STF3B	ZIP codes                35000	   3347	       120         3  1.5  
  
STF3C-1	nation			     1	   3347	         0.003  
STF3C-1	states (and DC)		    51	   3347	         0.2  
STF3C-1	  counties		  3141	   3347	        11  
STF3C-1	metr stat areas		   284	   3347	         1.0  
STF3C-1	total			  3477	   3347	        12         1  0.5  
  
STF3D	103rd Congress districts   435	   3347		 1.5   included with STF1D  
STF3D	104rd Congress districts   435	   3347		 1.5   included with STF1D  

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