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Version 02 Codebook                                                           
CODEBOOK VARIABLE DOCUMENTATION                                               
1948-1998 CUMULATIVE DATA FILE                                                
                   NES 1948-1998 CUMULATIVE DATA FILE                         
                          VARIABLE DOCUMENTATION                              
This file should be opened in fixed font, 10 pitch or smaller.                
(Note:  This file was created with 1" side margins in Courier 10;             
however, use of 9 pitch will prevent any inadvertent wrapping of              
text that may be produced as a result of slight differences in exact          
margin measurements among various text-processing programs).                  
Codebook introductory material and appendix material are in                   
separate files.                                                               
NOTE ON VARIABLE NAMING:                                                      
The variable name references used in NES Study codebooks do not include       
the "V" prefix found in all variable names used within the released           
SAS and SPSS data definition files (.sas and .sps files).                     
For example, "VAR CF0001" and "VAR VERSION" in Study codebooks refer to       
variables VCF0001 and VVERSION in the study data definition files.            
The following description of variable numbering describes the numbering       
standard now in use for all NES datasets.  SPECIAL NOTE FOR THE 1948-1998     
CUMULATIVE DATA FILE CODEBOOK:  this codebook documentation has been          
updated to correspond to the new numbering system in the identifying          
variable number of each variable entry ("VAR CF0001" etc.) but notes and      
references, do not yet entirely comply.                                       
'Numbered' variables in NES timeseries datasets and in Pilot datasets         
(except the 1998 Pilot) comply with the following format:                     
     2-digit year prefix  +  4 digits  +  [opt] 1-char suffix.                
Examples:  1978 Post variable V780002; 1983 Pilot variable V832101.           
Note that for datasets including data from multiple studies, the 2-digit      
year prefix corresponds to the appropriate study year to which the            
variable is associated; for example, the 1983 Pilot dataset also includes     
1982 timeseries variables, for which the 2-digit prefix is 82.                
Non-time-series studies other than Pilots use 2-character mnemonic            
prefixes, for example variable VPS0048 in the 1988-1990-1992 Pooled           
Senate Study dataset.                                                         
SPECIAL NOTE ON COLUMN LOCATIONS:                                             
Some numeric variables use coding schemes that allow for code values          
having a varying number of digits. In such instances, the number              
of columns corresponding to the variable in the data file [.dat file]         
and in the column specifications  will be the width of the maximum value      
occurring in the actual data, rather than the maximum width allowable         
by the coding scheme.  For example, if codes 01-12 are allowed for a          
numeric variable but all values in the data are less than 10, then the        
width of the variable will be output as 1.                                    

Walter Mebane
Mon Nov 12 02:55:58 EST 2001