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The effect of changing regional classifications
on statistical indicators
October 2008, Shanghai
Dr. Udo Maack
Germany
SCORUS Conference 2008
Changing Regional Classifications
1. The role and characteristicsof regional statistical indicators
2. What happens when regional classification changes?
3. Provisions to avoid a false reporting?
• Recalculation procedure
• Regional Classification Server (structure and products)
1. The role and characteristics of regional statistical indicators
Describe real world phenomena
Measure developments in time series
Compare between regions of … – one country – different countries (international)
Values must be normalizede.g. using area or population or (…)
2. What happens when regional classification changes?
Which changes may occur? (I)
Number of Provinces in Turkeybetween 1990 (Census) and 1999
68
70
72
74
76
78
80
82
Census
19901991 1992 1993 1994 1995 1996 1997 1998 1999
Which changes may occur? (II)
Changes regarding Provinces between census 1990 and 2000
0
2
4
6
8
10
12
14
16
Censu
s- 3
1.12
.199
019
9119
9219
9319
9419
9519
9619
9719
9819
99
Period
Num
ber
of C
hang
es
.
internal changesnew units
3. Provisions to avoid a false reporting?
(1) Provide a centrally maintained Regional Classification Server (RCS)
(2) Recalculate values and indicators
(3) Force the use of the newest classification on all production steps
Role of a central Regional Classification Server
Report B Report A
GeoCoding GeoCoding Statistical
Production Process A(Population)
Central
RCS
spatial analysis comparison, combination
Statistical Production Process B (Hospital)
FeedbackFeedback
/ Recalculation
/ Recalculation
Role of a central Regional Classification Server
External Data Production
RegionalStatistics DB
RCS
Manually preparedUploading
Uploading
Internal Data Production
MetaDatabase
Solution for the Turkish National Statistical Office TURKSTAT (under development)
External Data Provider
RegionalStatistics DB
Address DB
RCS
Quality assuredWorkflow for Uploading
Data Production
MetaDatabase
National Address DB
Recalculation of Values and Indicators
Basic - Values If surveyed / reported values are
• available, these values have to be aggregated from the original level to regional units according the new territorial division
Indicators must be calculated again from the basis values on all regional level
• not available, the existing values have to be recalculated using weighting factors– of other sources, if available preferred – derived from change of area or population,
which have to be provided in the RCS
Results of the recalculation of values
Basic structure of a RCS (I)
Standard Information: description of regional units with lifetime
Area PopulationToFromIdentifierName
timeLifeUnit
Basic structure of a RCS (I) Example
Basic structure of a RCS (II) Example
Date of change
From-Unit
To-
Unit
Area Popula-tion
Required extension:Change information
Basic structure of a RCS (II) Example
Products of the RCS (I)
• Status Table
• Conc-Moda*) Table [EU required]
• Correspondence Table
*) Conc-Moda: ………………….
Products of the RCS (II)
Status Table
Products of the RCS (III)
Conc-Moda Table
Products of the RCS (IV)
Conc-Moda Table
Products of the RC (V)
Correspondence Table
Recalculation of values
Summary
• The influence of regional changes is significant to statistical values (time series)
• Retrograde data should be adjusted to provide comparable data
• Provisions on data and methods
• Regional Classification Server
• Force all producers to use the RC-Server
Changing regional classifications
Acknowledgements:TURKSTAT (National Statistical Office of Turkey)
Ms. MelikeYildirim Head of Department Publication and Data Dissemination
USST-Project (Upgrading the Statistical System of Turkey; EU-Aid Project) Mr. Ullrich Eichler
Head of the Project Implementation Team
Thank You
Dr. Udo Maack,
Berlin,
Germany
eMail: [email protected]
Phone: +49 177 405 33 52
Changing regional classifications
?
