would have an upward bias, which would be eliminated when rebasing. In such cases, substituting an old outlet for a new one that provides a similar standard of service would be preferable.
Sample Rotation, Chaining, and Hedonic Indices
7.13 For some product groups, the productsamples will become quite out of date if left to the next update or revision for the sample to be reinitiated. This is especially so if the rebasing is infrequent. Sample rotation is equivalent to initiating a new sample, but for a product group that maintains the same weights until the
excessive use of the 1991 fixed coefficients, as well as the poor estimation methods for imputed rental of owner-occupied dwellings, consumption of fixed capital, and changes in inventories. The CPI could be improved by introducing the use of direct quality adjustments. The weights, the establishments, and the productsamples for the PPI should be updated at least every seven years. Intermediate data and statistical outputs are validated against other information, although the MFS and GFS data on central government financing are reconciled only once a year. Revision
University of Athens (Statistics Department).
Investigate the use of statistical methods for sample selection .
The NSSG is willing to investigate the possibility to introduce scientific sampling techniques and especially the possibility of introducing a probabilistic design of the outlet and productssample, considering the cost associated with different options. It has to be underlined that efforts and great steps have been made in the last revision of CPI where the geographical coverage was extended to the whole Greece as:
increase in the number of
and check which additional notes should be included into the publications to make data users aware of the provisional character of results.
B. Producer Price Index
1.) Implement procedures for (i) the periodic monitoring of local unit samples based on the quarterly production survey results, and (ii) the ongoing review of productsamples based on a rolling program of interviews with respondents between indexes rebases (3.1.1) .
(i) So far, local unit samples have been checked and resampled systematically every five years when the index was rebased to a
-term deviations in the trend GDP growth rate.
Give high priority to the completion of the integrated business register.
Producer Price Index
In order to ensure that the price indicators remain representative of contemporary market activity, implement procedures for (1) the periodic monitoring of local unit samples based on the quarterly production survey results, and (2) the ongoing review of productsamples based on a rolling program of interviews with respondents between index rebases.
Investigate opportunities for a more centralized PPI organizational model
the establishments accounting for the bottom 30 percent. If the latter price movements are expected to differ substantially from the former, then a sample of the latter ones may be selected and the weight of 24,000 apportioned to the selected smaller establishments using principles similar to those outlined above.
5.31 Within each establishment, there will be a sample of eligible products (see Chapter 6 , Section G.2, for a description of productsample selection). For each sampled product within the establishment, we can calculate its share of imports among the
the economy. Therefore, at this point it seems that such separation of the publication is not desirable. As stated, additional resources (that are currently not at our disposal) are crucial to integrate the input and output producer indices and increase their prominence.
Update the WPI weights more frequently and provide additional metadata on the index (e.g., how the weights are derived at each level of aggregation and how establishment and productsamples are drawn and maintained) .
The CBS updated the WPI weights in January 2006 based on the reference
done on a regular basis although it is expected that the index will be updated in 2010. The last update of the index was in 2000. There are few regular comprehensive industrial surveys that can be used to update the weights, the productsample, and the establishment sample for the PPI. Plans are underway to resolve this problem. As a first step, a draft of a new business register is now available.
24. An area for improvement pertains to the wage and employment data, which are currently available on an annual basis only. The authorities are looking at ways to
indices. Nevertheless, atypical movements in the data are investigated and corrected when necessary. Except for being compiled only by product aggregations and not by economic activity as well, the PPI is compiled based on concepts and definitions from the 1993 SNA and the international PPI Manual. However, the weights, the establishment sample, and the productsample for the PPI that were introduced in 2000 are based on 1997 sales data. Therefore, the index needs updating. A comprehensive assessment of the source data is being carried out, and is guiding the production
International Monetary Fund. Western Hemisphere Dept.
investigated and corrected when necessary.
Except for being compiled only by product aggregations and not by economic activity as well, the PPI is compiled based on concepts and definitions from the 1993 SNA and the international PPI Manual. However, the weights, the establishment sample, and the productsample for the PPI that were introduced in 2000 are based on 1997 sales data. Therefore, the index needs updating. A comprehensive assessment of the source data is being carried out, and this is guiding the production of new source data to update the PPI and the national