PROVIDE Project Technical Paper 2005:1
February 2005
Table of Contents
1. Introduction.................................................................................................................1
2. An overview of IES 2000 and the LFS 2000:2 ..........................................................1
2.1. Data files ...............................................................................................................1
2.1.1. IES 2000........................................................................................................1
2.1.2. LFS 2000:2....................................................................................................3
2.2. Sampling and weighting........................................................................................3
2.2.1. Survey design.................................................................................................3
2.2.2. Clustering and stratification .........................................................................4
2.2.3. The ‘design effect’.........................................................................................5
2.2.4. Unequal selection probabilities....................................................................6
2.2.5. Weights in Stata.............................................................................................6
2.2.6. Survey estimation in Stata.............................................................................8
2.3. Merging the IES 2000 and the LFS 2000:2 ........................................................10
2.3.1. Overview......................................................................................................10
2.3.2. Comparing IES 2000 and LFS 2000:2 data................................................11
2.4. IES 2000 data problems ......................................................................................16
2.4.1. Literature review.........................................................................................16
2.4.2. Comparing income and expenditure patterns with other data sources ......18
2.4.3. Income and expenditure patterns by deciles...............................................23
3. Stata do-files to extract and reorganise data (ies2000.do).....................................27
3.1. Reading in the data (readin.do)...........................................................................31
3.2. Forming a household-level IES 2000 dataset (ies2000h.do) ..............................31
3.2.1. Domestic workers (domworker.do).............................................................31
3.2.2. Home production for home consumption (homegrown.do) ........................32
3.2.3. Person-level data file (person.do)...............................................................34
3.2.4. General income and expenditure file (general.do) .....................................36
3.2.5. Cleaning the data (cleanup.do)...................................................................37
3.2.6. Annualising and creating control totals (annualise.do and totals.do)........48
3.2.7. Imputing ‘missing’ food and tax expenditure values..................................48
3.2.8. Mapping income and expenditure categories (mapexp.do and mapinc.do)50
3.3. Forming a person-level IES 2000 dataset (ies2000p.do) ....................................51
3.4. Cleaning up education and factor data in the LFS 2000:2 (lfs2000_2.do)..........51
4. Further data analysis and adjustments...................................................................52
4.1. Income and expenditure differences ...................................................................52
4.2. Adjusting the data (adjustments.do)....................................................................56
4.2.1. Merging the IES 2000 and LFS 2000:2 files (ieslfsmerge.do)....................58
4.2.2. Adjusting transfer variables (transfers.do).................................................58
4.2.3. Income and expenditure differences (fixing.do)..........................................59
4.2.4. Scaling up the person-level factor income variables (inclabpscaling.do)..60
4.2.5. Forming factor groups (newfact.do and newfact_old.do)...........................61
4.2.6. Forming variables for various possible household classifications.............62
4.3. Printing SAM sub-matrices (print.do) ................................................................62
5. Concluding remarks..................................................................................................63
6. References ..................................................................................................................63
7. Appendix....................................................................................................................64
7.1. Wage and salary income from labour - data adjustments...................................64
7.2. Household expenditure accounts.........................................................................66
7.3. Creating an inter-household transfers matrix......................................................66
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© PROVIDE Project
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