Sales index in retail trade and personal services
Documentation on methodology
Effective April 1, 2017, the methodology changes: See Services Production index,
Turnover index in services, Sales volume index in trade and Turnover index in trade.
From 2016 the calculation of the turnover indices is realised from the exhaustivity
of the monthly declarations of the fiscal source. This new methodology of calculation
of the indices was implemented to take better into account the demography of companies
and so it shows more precisely the economic reality. Indeed the indices of turnover
of one year N previously calculated did not take into account new business start-ups,
terminations, entrances into the statistic sphere, exits of the statistic sphere,
and changes of sector which happened during the year N, the sample being done the
31/12 of the year N-1.
Within the framework of a project for a renovation of the turnovers indices, solutions
were implemented to correct this bias and to produce turnover indices with better
quality. On one hand, annual samples will not be used anymore and all of the monthly
declarations of VAT will be exploited, the progress of the computing allowing to handle
very big volumes of data nowadays; on the other hand, the statistical directory Sirus
will be used instead of the administrative directory Siren, so as to benefit from
a provision much faster and automated of the most recent demographic events companies
have been affected.
Turnover indices in retail trade and personal services are monthly indices of value
in current euros excluding VAT; sales indices in volume are also calculated in retail
trade and personal services.
These indices are calculated in relation to a reference of 100 in 2010 (the indices
had a mean of 100 in 2010). They are calculated as Laspeyres indices, with constant
weightings over time of the most discriminating indices, and are rebased every five
years.
Sales volume and turnover indices in retail trade and personal services are adjusted
for seasonal variations (SDA) and for calendar effects (adjustment for working days
– WDA).
- A better taking into account of companies demography in monthly turnover indexes by a complete exploitation of monthly VAT returns (pdf, en, 58 Ko, 31/03/2016)
- What changed for turnover indexes since March 31st (pdf, en, 26 Ko, 31/03/2016)
- Sales volume in the retail trade and personal services (pdf, en, 37 Ko, 31/08/2016)