The new CPI of El SalvadorDec 2009=100

Jörgen Dalén

Statistical Consultant

Project steps

HBS/ENIGH for 2005/6 provided new expenditure weights CPI project started late 2006 Statistics Sweden became involved in early 2007

– SIDA has been the funding agency– Jörgen Dalén, principal consultant, 13 missions 2007-2010

Has worked internationally with CPI and other statistics in many countries– Major methodological problems covered

Index construction (formulas etc.) Specifying the product selection Sampling of outlets Handling of missing prices and replacements Special methods for some 15 products Quality control Rebasing to Dec09=100 Presentation of results

The new price indexes from January 2010

IPC, the official index IPC-A, analytical index, for analysts,

available on request IPC92, the old series will not continue after

Dec 92

The new IPC

Will have December 2009=100 The old CPI from 1992 will be chained into the

series, using the link month of December 2009 Between Dec92 and Dec09 this series will only be

available at the division and general levels. From Jan10 it will be available at all aggregation

levels: general, division, group, subgroup, class and product.

Monthly publication as before Available a few days after the end of month

CPI-A (analytical)

New CPI data exist from December 2007– For Dec07-Dec09 these data are kept in a database

separate from the official index

For all aggregation levels: general, division, group, subgroup, class and product.

This series is not official and gives different results than official CPI

Available for Government agencies and other experts and economic analysts on request

IPC92

This is the old index with December 1992=100

Aggregation levels: General, division, group, article

Index series ends in December 09

Weights, products, old and newComparisons

Go to spreadsheet– Weights– New and outgoing products– Different results

Two sets of CPI data collected for 2008-2009

Causes for difference– Different products in the index– Different weights for products– Different methodology

Special products, examples Most prices collected ín the field by price collectors

Airfares, price collection from websites Education, prices from Ministry of Education 1-2 times a year for all

levels PCs, special method to account for many replacements Mobile phone tariffs, user profiles used to account for changing

tariffs at main providers Rents, a special survey to around 250 tenant dwellings Electricity + water: Tariff changes followed for all users based on

amount of use Internet + Cable TV: Tariffs from main providers Cars: Prices from main sellers and a central organisation Also: Hospitals, craftsmen (artesanos), fixed telephony,

Results

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