Scanner Data
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Transcript Scanner Data
Scanner Data – next steps ahead
Berthold Feldmann – Eurostat
Price statistics; purchasing power parities; housing statistics
Structure of the talk
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Scanner data – a new paradigm
Main lessons of the last two days
Challenges
Time table and conclusion
Scanner Data Workshop – Stockholm June 2012
Chapter 1
A new universe
Scanner data as source for consumer
price indices
Expected advantages
Better quality of indices
Low response burden of enterprises
Productivity gains of National Statistical Institutes
Data can be used for other purposes
Purchasing Power Parities
Average price levels
Advanced economic analysis (e.g. substitution rates)
Regional breakdown of CPI/HICP
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Scanner data as source for consumer
price indices
Expected disadvantages
Potential biases in CPI / HICP
High investment costs (IT)
Some rules of European Implementing Regulations
may no longer be applicable
Treatment of rebates
Quality adjustment
Direct collection of “price observations”
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Chapter 2
Lessons learnt in the Workshop
Some general conclusions
We are still at an early stage in the use of scanner
data as a data source
Several problems still need to be solved
Scanner data appears quite promising for the collection
of Multipurpose Consumer Price Statistics
Scanner data cannot be used for all COICOP groups
Scanner data offers high quality information of actual
transactions
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Conclusions on discounts
Discounts are an important stimulus for increased sales
important for consumers
Scanner data offers new opportunities for a more
precise treatment of discounts
compared to traditional price collection
For HICP – the inclusion of all non-discriminatory price
reductions should be the rule
Precise recommendations should be drafted a.s.a.p.
We might need to evaluate the existing regulatory
framework on price reductions
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Practical experience
The exchange of views and experiences between NSIs
could save a lot of time
Avoid reinventing the wheel
Full support from the top management of retailers is
mandatory
Good collaboration with data providers is a key point
More volatility and some short and medium term
differences when changing the price concept
(transaction price versus shelf price)
Major challenge: high attrition rate (up to 30%)
Promising results with the use of “internal” classifications
as links between EAN and COICOP
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Computation methods
From GEKS to RYGEKS
From RYGEKS to imputed Tornquist RYGEKS
Three different methods are tested for the
imputation of prices for new and disappearing items
Conclusion
at the lowest level of computation we might need to
go beyond Laspeyres ... ...
Mainly used for benchmarking
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Chapter 3
Challenges
Link EAN - COICOP
EAN differ from country to country
A high proportion of EAN have a life span of less
than a year
This results in a high turnover rate of product types
Automating the link of EAN to COICOP level 5 or 6
is not a trivial task
In the long run a harmonisation of EAN across
Europe would be desirable
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Use a sample or all data?
Current practise differs between countries
A harmonised approach should be achieved
Advantages and disadvantages of the two
approaches should be discussed carefully
Using a sample is closer to the traditional
price observations
Using all data might offer new opportunities
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Automation of editing EAN data
Problem of many products disappearing and
others emerging within a year
Practice of some advanced National Statistical
Offices can give guidelines
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Weighted or not weighted average?
(product level)
Should quantity information be used at basic
calculations?
Quantities may show huge fluctuations
A Europe-wide recommendation should be
achieved
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Scanner data as a source for weights
(level of product groups)
Quantities from scanner data could be used as
weights at the lowest level (COICOP 5 or 6)
In any case, only annual averages should be
used as weights
According to Implementing Regulation no
changing weights from month to month
Volatility of the data?
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Further information collected
Scanner data contains more than prices and
quantities
Product description is important for EAN –
COICOP link
Information on discounts may be useful for
further data analysis for economic purposes
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Scanner data versus price collectors
Different results are reported from the two
alternative sources for consumer price indices
A thorough analysis is required to explain these
differences
Algorithms to be found for possible bias in
scanner data
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Legal obligations
National law may set different obligations in
different countries
Are stores obliged to supply scanner data?
Can European legislation help?
COUNCIL REGULATION (EC) No 2166/1999
The statistical units … called upon by the Member States to
cooperate in the collection or provision of basic information
are obliged to give honest and complete information at the
time it is requested and allow the organisations and
institutions responsible for compiling official statistics, on
request, to obtain information at the level of detail
necessary ………
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IT environment
High investment costs to start the regular usage
of scanner data
Economies of scale possible if similar solutions are
used in different countries
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Chapter 4
Provisional time table
A proposal for a timetable
Continue intensive discussion among experts
Enhance transparency on current practice in all European
countries
Eurostat will create an overview of current practice
in summer 2012
Discussion at the Working Group meeting in
October 2012
Meeting of the Task Force “Multipurpose price
statistics” shall draft first recommendations in
January 2013
Incorporation of basic rules on the use of scanner
data in the new HICP Regulation
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Conclusion
The use of scanner data offers several advantages
for future price statistics (not only consumer price
indices)
Some issue connected with the use of scanner data
are not easy to solve and require a harmonised
approach
The European legal framework might need to be
assessed if some rules need an adaptation for the
use of scanner data
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Thank you for
your attention!
Any Questions ?