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The
Data: Coverage, Periodicity, and Timeliness
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Coverage
characteristics
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5.1.1 Statistical
presentation
·
The Wholesale Price Index (WPI) is a Laspeyres
index（2016=100）,
measuring the average changes of selling prices received by producers for
their outputs, such as raw materials, semi-finished products and finished
products. The WPI comprises the Domestic Wholesale Price Index (DWPI),
Import Price Index (IPI) and Export Price Index (EPI).
·
The WPI covers 1,195 items: DWPI
covers 596 items, IPI covers 304 items and EPI covers 295 items. Most of
the prices are collected through a monthly mail survey or Internet
Reporting System. The designated companies report the actual selling prices
of selected commodities with the same specifications (in principle, price
after adjustment for rebate, tax, shipment, etc.) around the 20th of each
month.
·
The weights of DWPI manufacturers are
obtained from the Industrial Production Statistics, National Income
Statistics and data provided by relative associations that are gathered in
2019. For non-manufacturers (Agriculture, Forestry, Fishing, Water Supply,
etc.), the weights are referred to the Year books of Agriculture, Forestry,
Fishing, Water Supply and Electricity. The weights of IPI and EPI are based
on the customs-clearing values of import goods of 2019 in Taiwan Area,
including re-imports. The values of import (export) items not sampled are
being added proportionally to that of surveyed items similar in attributes
and price trends.
- The
indices as a whole are normally re-based about five years and the
weights are changed every 2-3 years.
- Seasonally
adjusted and unadjusted indices are provided.
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Periodicity
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4.1.1
Periodicity
Monthly
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Timeliness
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4.1.2 Timeliness
Around
the fifth working day (subject to postponement due to Chinese Lunar New
Year or other consecutive public holidays) after the end of the reference
month.
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Access
by the Public
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Advance
dissemination of release calendar
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5.1.3 Advance release calendar
- In
principle, the press release is made around the fifth working day
(subject to postponement due to Lunar New Year or other consecutive
national holidays) after the end of the reference month. The date
of the next release is announced in each news release.
- A
schedule of the precise release dates for the Calendar year is listed
on the website:
https://win.dgbas.gov.tw/dgbas03/bs7/sdds/english/calendar.htm
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Simultaneous release to all interested parties
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5.1.4 Simultaneous
release
- Subject to
data sensitivity, no information is released prior to the official
release. The data are released to all interested parties at
4:00P.M. on the release day.
· The
reference data are also available on the website:
https://eng.stat.gov.tw/lp.asp?ctNode=2410&CtUnit=1016&BaseDSD=7
·
The
e-book “Price Statistics Monthly” is made available immediately at the time
of release, please see
https://eng.stat.gov.tw/lp.asp?ctNode=1559&CtUnit=713&BaseDSD=7
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Integrity
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Dissemination of terms and conditions under which official statistics
are produced, including ...
Confidentiality of individual responses
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0.1.1 Responsibility for
collecting, processing, and disseminating statistics
- All statistics collected,
compiled and published by the DGBAS are governed by the Statistics Act
and the Enforcement Rules.
- The data on the price indices are
disseminated by the DGBAS as a service to the public.
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Identification of internal government access to
data before release
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1.2.2 Internal
governmental access to statistics prior to release
The
information published in the press release and advance copies of the WPI
news release are provided to the President, the Premier, the Vice Premier
and the Governor of Central Bank of the R.O.C before official release.
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Identification of ministerial commentary on the
occasion of statistical releases
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1.2.3 Attribution of statistical products
No
ministerial commentary is released with these data. Department of
Statistics, DGBAS, Executive Yuan provides its own analytical commentary
with these data releases.
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Provision of information about revision and
advance notice of major changes in methodology
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4.3.1 Revision
schedule
·
All seasonally adjusted and unadjusted
WPIs are routinely subject to revision for up to 3 months after preliminary
publication. Indices are revised to reflect late reports and corrections
received from respondents. A final estimate will be issued in 3 months
after initial publication. Besides, the seasonally adjusted monthly data
from 2013 to last year are revised at the time of the release of the April
WPI.
- Major
program changes are made on WPI re-basing every 2-3 years. As soon as
the re-basing process is finished, the new results are announced in
the upcoming February with data of January.
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Quality
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Dissemination of documentation on methodology and
sources used in preparing statistics
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5.2.1 Dissemination
of documentation on concepts, scope, classifications, basis of recording,
data sources, and statistical techniques
Detailed
methodological document can be obtained on the website
https://eng.stat.gov.tw/public/data/dgbas03/bs3/book/descriptionc.pdf
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Dissemination of that support statistical
cross-checks and provide assurance of reasonableness
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4.2.1 Temporal
consistency
- The “Price
Index” news release publishes a monthly analysis of price movements
and summary tables on the WPI.
- The e-book
“
Price Statistics Monthly” is made
available immediately at the time of release.
- The WPI is
further broken down into (a) basic group; (b) indices by waygoing and
by origins; (c) indices for domestic sales by basic group; (d) indices
for domestic sales by stage of processing; (e) time series of WPI.
- The IPI is
further broken down into (a) basic group; (b) Indices by usage; (c)
time series of IPI.
- The EPI is
further broken down into (a) basic group; (b) Indices by usage; (c)
time series of EPI.
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