***SITC (Revision 2 and 3, 5-digit) Export Data, 1978-2001***



Using the files EXP*.ASC for 1978-2001, the export data are summed

according to the 5-digit Standard International Trade Classification

(SITC), Revision 2 and 3 codes.  The results are stored in EXP_SITC78.ASC,

....,EXP_SITC01.ASC.



Record Layout:



The variables included in 1978-1988 are:



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 1978-1988 files

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

columns 20-27     -  Source country name

columns 29-39     -  Value (dollars)

columns 41-42     -  Year



The variables included in 1989-2001 are:



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     -  Value (dollars)

columns 42-44     -  Year





Special Considerations:



1. 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.



2. The Rev. 2 SITC numbers were missing for many of the commodities

with Schedule B numbers that were only used only in 1978.  These Rev. 2

SITC numbers have been imputed by using the first 5 digits of the

corresponding Schedule E number from CON78_88.ASC, or by using the

description and SITC number for closely matched commodities.



3. For 1978-1988, 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.





Size:  Each file SITC*.ASC is between 3 and 8 megabytes.



Related Files:



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

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



2. The commodity names corresponding to each SITC code, for each

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

and SITCREV3.ASC.



3. Concordances between the various revisions of the SITC are found

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



4. The data in SITC*.ASC is a summation of that found in EXP*.ASC.  Thus,

the details about each variable provided in the documentation to

EXP*.ASC also applies to SITC*.ASC.