SURVEY OF INCOME AND PROGRAM PARTICIPATION,
       2001 PANEL LONGITUDINAL WEIGHT FILE DATA DICTIONARY


DATA        SIZE  BEGIN
   
D LGTKEY      8      1
T PE: Person longitudinal key
     The longitudinal key is in sort by 
     scrambled id (SSUID). The first five 
     digits of the key contain a longitudinal 
     sequence number which is unique for the 
     sample unit across all waves. The last 
     three digits contain a person's index 
     which identifies a person within a sample 
     unit and is unique for a person across 
     all waves. This key can be used to merge 
     people longitudinally. 
U All persons 
V 1001:50000001 .Longitudinal Key

D SPANEL      4      9
T SU: Sample Code - Indicates Panel Year
U All persons 
V       2001 .Panel Year

D SSUID      12     13
T SU: Sample Unit Identifier
     Sample Unit identifier This identifier is 
     created by scrambling together the PSU, 
     Segment, Serial, Serial Suffix of the 
     original sample address. It may be used 
     in matching sample units from different 
     waves. 
U All persons 
V 000000000000:999999999999 .Scrambled Id

D EPPPNUM     4     25
T PE: Person number
     Person number. This field differentiates 
     persons within the sample unit. Person 
     number is unique within the sample unit. 
U All persons 
V    101:999 .Person number

D LGTPNWT1   10     29
T WW: Longitudinal Panel Weight
     Longitudinal panel weight based on sample 
     universe in Waves 1 through 4 
U All persons 
V 00000:9999999999 .Weight

D LGTPNWT2   10     39
T WW: Longitudinal Panel Weight
     Longitudinal panel weight based on sample 
     universe in Waves 1 through 7 
U All persons 
V 00000:9999999999 .Weight

D LGTPNWT3   10     49
T WW: Longitudinal Panel Weight
     Longitudinal panel weight based on sample 
     universe in Waves 1 through 9 
U All persons 
V 00000:9999999999 .Weight

D LGTCY1WT   10     59
T WW: Longitudinal First Calendar Year Weight
     Calendar year 2001 
U All persons 
V 00000:9999999999 .Weight

D LGTCY2WT   10     69
T WW: Longitudinal Second Calendar Year Weight
     Calendar year 2002 
U All persons 
V 00000:9999999999 .Weight

D LGTCY3WT   10     79
T WW: Longitudinal Third Calendar Year Weight
     Calendar year 2003 
U All persons 
V 00000:9999999999 .Weight