***SITC (Revision 2 and 3, 5-digit) Import Data, 1972-2001***



Using the files IMP*.ASC for 1972-2001, the import data are summed 

according to the 5-digit Standard International Trade Classification 

(SITC) codes.  The results are stored in IMP_SITC72.ASC,....,IMP_SITC01.ASC.



Record Layout for 1972 - 1988:



columns 1-5	-  SITC Rev. 2 number (5-digit)

columns 7-11	-  SITC Rev. 3 number

		   A 3-digit Revision 3 is used in the 1972-1988 files

columns 13-18	-  Country code (UN codes are used, as listed in COUNTRY.TXT)

columns 20-27	-  Source country name

columns 29-40	-  Customs value, Imports for Consumption (dollars)

columns 42-53	-  CIF value (dollars)

columns 55-66	-  Duties paid (dollars)

columns 68-69	-  Year 



Record Layout for 1989 - 2001:



columns 1-5	-  SITC Rev. 2 number (5-digit)

columns 7-11	-  SITC Rev. 3 number

		   A 5-digit Revision 3 number for 1989-2001

columns 13-18	-  Country code (UN codes are used, as listed in COUNTRY.TXT)

columns 20-27	-  Source country name

columns 29-40	-  Customs value, Imports for Consumption (dollars)

columns 42-53	-  Customs value, General Imports (dollars)

columns 55-66	-  CIF value (dollars)

columns 68-79	-  Duties paid (dollars)

columns 81-83	-  Year 



Special Considerations:



1. See the file IMP89_01.TXT for a detailed definition of all variables.

CIF value is computed as the sum of Customs Value, Imports for Consumption,

and Import Charges (import charges equal freight plus insurance).



2. For 1972-1977, the SITC Rev. 2 codes have been imputed using information 

on:  (a) the SITC Rev. 2 codes used for a like-named TSUSA commodity in 

later years; (b)  the SITC Rev. 1 code used for that commodity, and the 

concordance SITCR1_2.ASC between Rev. 1 and Rev. 2.  This imputation may 

cause some irregular movement in the import values across 5-digit SITC 

Rev. 2 categories over 1977-1978. In cases where a 5-digit SITC Rev. 2 

code could not be imputed, a 4-digit (or more aggregate) code is used 

instead, with zero appended as the fifth digit.



3. For 1972-1988, the data were initially organized on a 5-digit SITC 

Rev. 2 basis.  Then the SITC Rev. 3 codes were imputed using the 

concordance contained in SITCR3_2.ASC.  Because this imputation is 

difficult to perform when going from Rev. 2 to 3 (because Rev. 3 is 

more disaggregate at the 5-digit level), only the 3-digit Rev. 3 codes 

are used.  This imputation may cause some irregular movement in the 

import values across 3-digit SITC Rev. 3 categories over 1988-1989. 

In cases where a 3-digit SITC Rev. 3 code could not be imputed, a 

2-digit code is used instead, with zero appended as the third digit.  

Any given 3-digit SITC Rev. 3 number will generally appear multiple 

times in a year, corresponding to different 5-digit SITC Rev. 2 

numbers.  Thus, to compute the value of imports by 3-digit Rev. 3 code, 

it is necessary to sum over all records for each such code.



4. For 1989-2001, the data are initially organized on a 5-digit

SITC Rev. 3 basis.  In this case the concordance SITCR3_2.ASC gives

a unique 5-digit SITC Rev. 2 code for each of the Rev. 3 codes.

So these Rev. 2 codes were added into the file for each year,

and then the records were re-sorted according to the Rev. 2

codes.  As is apparent by inspection, each 5-digit Rev. 2

code can appear more than once.  Thus, to compute the value of 

imports by 5-digit Rev. 2 code, it would be necessary to sum over

all records for each such code.



5.  Also included in these files are the variables listed above summed 

over all source countries, in which case the Country name is listed as 

WORLD, and the Country code is 100000.



Size:  Each file IMP_SITC*.ASC is between 2 and 10 megabytes.



Related Files:



The prices for 2-digit and selected 3-digit Rev. 3 SITC imports can be 

found in SITPRICE.ASC, as described in SITPRICE.TXT.



The commodity names corresponding to each SITC code, for each

revision of the SITC, are found in SITCREV1.ASC, SITCREV2.ASC,

and SITCREV3.ASC.



Concordances between the various revisions of the SITC are found

in SITCR2_1.ASC, SITCR2_3.ASC and SITCR3_2.ASC. 



The data in IMP_SITC*.ASC is a summation of that found in IMP*.ASC.  Thus, 

the details about each variable provided in the documentation to 

IMP*.ASC also applies to IMP_SITC*.ASC.