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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 Indices (WPI) comprise the Domestic Wholesale
Price Index (DWPI), Import Price Index (IPI) and Export Price
Index (EPI). The Wholesale Price Indices is weighted average of
these three indices. All are Laspeyres indices with a base year
2016=100.
- The
Wholesale Price Indices are to measure the average price movements in
selling prices of materials, semi-finished and finished goods for Taiwan.
The Wholesale Price Indices covers 1117 items: DWPI covers 548 items,
IPI covers 288 items and EPI covers 281 items. The 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 specification (in principle, price
after adjustment for rebate, tax, shipment, etc.) around the 20th of
each month.
- The weights
of DWPI manufacturer are obtained from the Industrial Production
Statistics, National Income Statistics and data provided by relative
associations are referred in 2016. For non-manufacturers (Agriculture,
Forestry, Fishing, Water Supply, etc.), the weights are referred to
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 20 16 in
Taiwan Area, including re-imports. The values of
import (export) items outside the sample 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:
http://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 embargo, 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:
http://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
http://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 for the
previous 5 years 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
http://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 and domestic products 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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