24 Correspondences are provided with the classification containing two way correspondence tables between ANZSPC items and related items of the ANZSCC1 ANZSIC4, HS6, SITC5 and CPC2 . Correspondences between different classifications identify the relationship between respective categories. An item in one classification can be equivalent to one or more whole or part items in another classification.
25 Correspondences to the underlying international standard product classifications (the CPC, the HS and the SITC) are provided to aid both the determination of the scope of individual categories (via the explanatory notes to the HS and the CPC) and the level to which individual ANZSPC categories can be related to individual categories of those classifications.
26 In particular, the correspondences linking ANZSIC industries of origin to ANZSPC items are included to assist those wishing to analyse the product coverage of ANZSIC industries. However, care needs to be taken in relating product statistics to their industry of origin. ABS industry statistics are based upon information from businesses classified to their main industrial activity. This means that any secondary industrial activity by a business will be accounted for under its primary industry classification. Therefore, product aggregates calculated on an industry of origin basis will not necessarily be compatible with official industry statistics. This concept is explained further in the introduction to the ANZSIC.
27 A correspondence linking ANZSPC items to ANZSCC items is also included to assist in comparing Australian and New Zealand product statistics over time.
28 A correspondence does not necessarily enable exact comparability between data compiled according to different classification schemes. The main issue in using correspondences is in knowing how to treat part relationships. This usually involves determining the scope of the categories under consideration in both classifications and determining which components of the categories are shared in common. For example, some ANZSPC items are the direct equivalent of HS items, while many are either combinations of HS items or dissections of HS items. To establish the level at which comparisons can be made, where the relationship is other than one to one, it is necessary to aggregate the HS components of multiple ANZSPC items to the point where they can be grouped together for comparison with equivalent groups of import or export items.