Meeting of Experts on Consumer Price Indices Geneva, 10-12 May 2010. Quality adjustment Survey by purchase of products : The AFRISTAT experience in West and Central African countries _____________________________________ Claude Tchamda, expert in price statistics, AFRISTAT
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The products of the consumption basket are classified into 4 groups:
1- The heterogeneous products: this group comprises mainly manufactured product and services (HE).
2- The homogeneous products sold in conventional UoM (O1).
3- The homogeneous products sold with non conventional units but more or less equivalent among outlets or sellers (O2).
4- The homogeneous products sold with non conventional units different from one outlet or seller to another (O3).
The minimum number of observations is 30.
The balances used to weight products are electronic with a precision of 1g.
The computation of data is realized with a software (CHAPO) that integrates this method.
With time, some of these products are downgraded from O3 to O2 or from O2 to O1.
In the context of harmonization of practices and limited qualified human resources, these methods, are