Preface xi
Chapter 1 Register Surveys ? An Introduction
1
1.1 The purpose of the book 1
1.2 The need for a new theory and new methods 3
1.3 Four ways of using administrative registers 5
1.4 Preconditions for register-based statistics 6
1.4.1 Reliable administrative systems 7
1.4.2 Legal base and public approval 8
1.5 Basic concepts and terms 10
1.5.1 What is a statistical survey? 10
1.5.2 What is a register? 11
1.5.3 What is a register survey? 13
1.5.4 The Income and Taxation Register 14
1.5.5 The Quarterly and Annual Pay Registers 16
1.6 Comparing sample surveys and register surveys 20
1.7 Conclusions 23
Chapter 2 The Nature of Administrative Data 25
2.1 Different kinds of administrative data 25
2.2 How are data recorded? 26
2.3 Administrative and statistical information systems 27
2.4 Measurement errors in statistical and administrative data
29
2.5 Why use administrative data for statistics? 30
2.6 Comparing sample survey and administrative data 32
2.6.1 A questionnaire to persons compared with register data
32
2.6.2 An enterprise questionnaire compared with register data
34
2.7 Conclusions 36
Chapter 3 Protection of Privacy and Confidentiality
37
3.1 Internal security 38
3.1.1 No text in output databases! 38
3.1.2 Existence of identity numbers 39
3.2 Disclosure risks ? tables 40
3.2.1 Rules for tables with counts, totals and mean values
41
3.2.2 The threshold rule ? analyse complete tables! 43
3.2.3 Frequency tables are often misunderstood 44
3.2.4 Combining tables can cause disclosure 45
3.3 Disclosure risks ? micro data 45
3.4 Conclusions 46
Chapter 4 The Register System 47
4.1 A register model based on object types and relations 47
4.1.1 The register system and protection of privacy 53
4.1.2 The register system and data warehousing 53
4.2 Organising the work with the system 54
4.3 The populations in the system 56
4.3.1 How to produce consistent register-based statistics 57
4.3.2 Registers and time 58
4.3.3 Populations, variables and time 59
4.4 The variables in the system 60
4.4.1 Standardised variables in the register system 60
4.4.2 Derived variables 62
4.4.3 Variables with different origins 63
4.4.4 Variables with different functions in the system 64
4.5 Using the system for micro integration 65
4.6 Three kinds of registers with different roles 70
4.7 Register systems and register surveys within enterprises
72
4.8 Conclusions 74
Chapter 5 The Base Registers in the System 77
5.1 Characteristics of a base register 77
5.2 Requirements for base registers 78
5.2.1 Defining and deriving statistical units 78
5.2.2 Objects and identities ? requirements for a base
register 80
5.2.3 Coverage and spanning variables in base registers 81
5.3 The Population Register 83
5.4 The Business Register 88
5.5 The Real Estate Register 93
5.6 The Activity Register 94
5.7 Everyone should support the base registers! 98
5.8 Conclusions 101
Chapter 6 How to Create a Register ? Matching and
Combining Sources 103
6.1 Preconditions in different countries 103
6.2 Matching methods and problems 105
6.2.1 Deterministic record linkage 105
6.2.2 Probabilistic record linkage 106
6.2.3 Four causes of matching errors 112
6.3 Matching sources with different object types 114
6.4 Conclusions 120
Chapter 7 How to Create a Register ? The
Population 121
7.1 How should register surveys be structured? 121
7.2 Register survey design 125
7.2.1 Determining the research objectives 125
7.2.2 Making an inventory of different sources 128
7.2.3 Analysing the usability of administrative sources 128
7.3 Defining a register?s object set 131
7.3.1 Defining a population 131
7.3.2 Can you alter data from the National Tax Agency? 134
7.3.3 Defining a population ? primary registers
135
7.3.4 Defining a population ? integrated registers
136
7.3.5 Defining a calendar year population 137
7.3.6 Defining a population ? frame or register
population? 138
7.3.7 Base registers should be used when defining populations
141
7.4 Defining the statistical units 142
7.4.1 Units and identities when creating primary registers
143
7.4.2 Using administrative objects instead of statistical units
144
7.5 Creating longitudinal registers ? the population
145
7.6 Conclusions 146
Chapter 8 How to Create a Register ? The
Variables 147
8.1 The variables in the register 147
8.1.1 Variable definitions 148
8.1.2 Variables in statistical science 149
8.1.3 Variables in informatics 150
8.1.4 Creating register variables ? check list 151
8.2 Forming derived variables using models 151
8.2.1 Exact calculation of values using a rule 152
8.2.2 Estimating values with a rule 153
8.2.3 Estimating values with a causal model 154
8.2.4 Derived variables and imputed variable values 157
8.2.5 Creating variables by coding 158
8.3 Activity data 159
8.3.1 Activity statistics 160
8.3.2 Activity data aggregated for enterprises and organisations
161
8.3.3 Activity data aggregated for persons ? multi-valued
variables 161
8.4 Creating longitudinal registers ? the variables
165
8.5 Conclusions 169
Chapter 9 How to Create a Register ? Editing
171
9.1 Editing register data 171
9.1.1 Editing one administrative register 173
9.1.2 Consistency editing ? is the population correct?
175
9.1.3 Consistency editing ? are the units correct? 178
9.1.4 Consistency editing ? are the variables correct?
180
9.2 Case studies ? editing register data 181
9.2.1 Editing work within the Income and Taxation Register
181
9.2.2 Editing work with the Income Statement Register 183
9.2.3 What more can be learned from these examples? 184
9.3 Editing, quality assurance and survey design 185
9.3.1 Survey design in a register-based production system
185
9.3.2 Quality assessment in a register-based production system
186
9.3.3 Total survey error in a register-based production system
191
9.4 Conclusions 192
Chapter 10 Metadata 193
10.1 Primary registers ? the need for metadata 193
10.1.1 Documentation of administrative sources 194
10.1.2 Documentation of sources within the system 195
10.1.3 Documentation of a new register 195
10.2 Changes over time ? the need for metadata 195
10.3 Integrated registers ? the need for metadata 196
10.4 Classification and definitions database 197
10.5 The need for metadata for registers 198
10.6 Conclusions 200
Chapter 11 Estimation Methods ? Introduction
201
11.1 Estimation in sample surveys and register surveys 202
11.2 Estimation methods for register surveys that use weights
203
11.3 Calibration of weights in register surveys 204
11.4 Using weights for estimation 207
11.5 Conclusions 208
Chapter 12 Estimation Methods ? Missing Values
209
12.1 Make no adjustments, publish ?value unknown?
210
12.2 Adjustment for missing values using weights 214
12.3 Adjustment for missing values by imputation 215
12.4 Missing values in a system of registers 218
12.5 Conclusions 220
Chapter 13 Estimation Methods ? Coverage Problems
221
13.1 Reducing overcoverage and undercoverage 221
13.1.1 Coverage problems in the Population Register 221
13.1.2 Coverage problems in the Business Register 222
13.2 Estimation methods to correct for overcoverage 224
13.3 Undercoverage in the administrative system 226
13.4 Conclusions 228
Chapter 14 Estimation Methods ? Multi-valued Variables
229
14.1 Multi-valued variables 229
14.2 Estimation methods 232
14.2.1 Occupation in the Activity and Occupation Registers
232
14.2.2 Industrial classification in the Business Register
236
14.2.3 Importing many multi-valued variables 238
14.2.4 Consistency between estimates from different registers
242
14.2.5 Multi-valued variables ? what is done in practice?
245
14.2.6 Additional estimation methods 247
14.3 Application of the method 251
14.4 Linking of time series using combination objects 254
14.4.1 Linking time series 254
14.4.2 Changed industrial classification in the Business
Register 256
14.5 Conclusions 258
Chapter 15 Theory and Quality of Register-based Statistics
259
15.1 Is there a theory for register surveys? 259
15.1.1 Statistical inference at a national statistical office
260
15.1.2 Theory-based methods or ad hoc methods 262
15.1.3 The survey approach and the systems approach 263
15.2 Measuring quality ? why and how? 267
15.3 Analysing administrative sources ? input data quality
271
15.4 Output data quality 278
15.5 The integration process ? integration errors 279
15.5.1 Creating register populations ? coverage errors
280
15.5.2 Creating statistical units ?errors in units 282
15.5.3 Creating statistical variables ? errors in
variables 283
15.6 Random variation in register data 288
15.7 The register system and data warehousing 291
15.8 Conclusions 295
Chapter 16 Conclusions 297
References 301
Index 305
