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1 ( o ns) Occupational coding in practice: from the 1981 to 2001 Census of Population Tessa Staples June 2004.

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Presentation on theme: "1 ( o ns) Occupational coding in practice: from the 1981 to 2001 Census of Population Tessa Staples June 2004."— Presentation transcript:

1 1 ( o ns) Occupational coding in practice: from the 1981 to 2001 Census of Population Tessa Staples June 2004

2 2 Census Occupational Coding 1981 to 2001 Transition 1981Manual or Clerical coding - 10% Sample 1991Computer assisted coding - 10% sample 2001Automated coding (automatic coding and interactive coding) - No sample processing

3 3 Census Occupational Coding 1981 to 2001 Census processing 1981Managed in-house - Titchfield and Bootle offices 1991Managed in-house - Titchfield and Hillington offices 2001Contracted to Lockheed Martin - Widnes office

4 4 Census Occupational Coding 1981 to 2001 Classifications and coding frames 1981Classification of Occupations 1980 351 operational codes 1991Standard Occupational Classification (1990) 480 component codes 2001Standard Occupational Classification 2000 353 unit group codes

5 5 Census Occupational Coding 1981 to 2001 Information needed by the coding index CO80 SOCSOC 1990 2000 Job title Job description Industry of employer Professional qualifications Employee/Self-employed Major organisation

6 6 Census Occupational Coding 1981 to 2001 Occupation coding index Principles and layout style were devised for efficient clerical coding Simple look-up Quicker coding Greater coding consistency

7 7 Census Occupational Coding 1981 to 2001 Occupation coding index Using indexing words Warehouse manager Warehouse salesman Warehouse cleaner

8 8 Census Occupational Coding 1981 to 2001 Occupation coding index Using indexing words Warehouse manager = 1162 Warehouse salesman = 7111 Warehouse cleaner = 9233

9 9 Know your onions - at the check-out Why cant I find onion in the list? Census Occupational Coding 1981 to 2001

10 10 Know your onions - at the check-out Because listed as Brown onion Census Occupational Coding 1981 to 2001

11 11 Census Occupational Coding 1981 to 2001 Occupation coding index Reverse word order In response - Pest control inspector In index - Inspector, control, pest Brings together variations on the indexing word in one place Enables use of default entries

12 12 Census Occupational Coding 1981 to 2001 Occupation coding index Qualifiers to indexing words Occupation qualifiers Additional qualifiers Industry qualifiers

13 13 Census Occupational Coding 1981 to 2001 Occupation coding index List for Gateman 8219Gateman, bridge 8219Gateman, dock 8219Gateman, flood 8219Gateman, lock 8216Gateman (coal mine) 8219Gateman (docks) 9249Gateman (entertainment) 8216Gateman (railways) 8219Gateman (waterways) 9241Gateman

14 14 Census Occupational Coding 1981 to 2001 Occupation coding index List for Chain makers 5495Maker, chain (metal, precious) 8129Maker, chain (metal) 5211Maker, chain (metal trades, forging) 8129Maker, chain (metal trades) 8113Maker, chain (textile mfr)

15 15 Census Occupational Coding 1981 to 2001 Occupation coding index Power of the default entries (from use of index in 1991 Census) Cleaner35.9% Cleaner, school 8.0% Cleaner, office 6.4% Cleaner, window 6.0%

16 16 Census Occupational Coding 1981 to 2001 Organisation - 1981 and 1991 Censuses Headquarters Instructions, coding indexes (amendments), training exercises Analysis of coding queries Independent quality control - blind checking Audit inspection - 1991 only Teams coding occupation and employment status Supervisors - answered coding queries Coders Query writers - 1991 only Query resolvers - 1991 only

17 17 Census Occupational Coding 1981 to 2001 Organisation - 2001Census Headquarters - ONS Guidance, master copy of coding index (amendments), tuning data (thousands of coded job titles in natural word order) Second stop query resolvers Sight checking Teams coding occupation (some cross-topic training) Supervisors Frontline coders Expert coders - First stop query resolvers

18 18 Census Occupational Coding 1981 to 2001 1981 Census coding Coders used Census specific coding instructions –also on an A3 sized flowchart Modified Occupation Coding Index –notes on coding –most industry qualifiers converted to Census industry codes

19 19 Census Occupational Coding 1981 to 2001 1981 Census Modified Occupation Coding Index Gateman; bridge … … … … … 338 dock … … … … … 338 flood … … … … … 338 lock … … … … … 338 Gateman- … … … … … 140 503 … … … … … 321 742 … … … … … 321 746, 749 - waterways.. … … … 338 750 … … … …... 338 801,802 … … … … 165

20 20 Census Occupational Coding 1981 to 2001 1991 Census coding Coders used Census specific coding instructions –also on an A3 sized flowchart Computer Assisted Census Occupation Coding (CACOC) –displayed the modified occupation coding index on the screen of a stand- alone PC

21 21 Census Occupational Coding 1981 to 2001 1991 Census coding CACOC developed by Census IT staff at General Register Office for Scotland (GROS) similar to the Australian coding tool, ASCO not to reduce the number of coders but achieve better coding consistency (?)

22 22 Census Occupational Coding 1981 to 2001 1991 Census - CACOC OCCUPATION TITLE: GATEMAN Gateman bridge dock flood lock 503 742 746,749 waterways 750 801,802 Except above

23 23 Census Occupational Coding 1981 to 2001 1991 Census - CACOC OCCUPATION TITLE: GATEMAN Gateman bridge dock flood lock 503 742 746,749 waterways 750 801,802 Except above 420

24 24 Census Occupational Coding 1981 to 2001 2001 Census Capture and coding contracted to Lockheed Martin LM chose ACTR (Automated Coding by Text Recognition) as the coding tool ONSs Census staff specified contract and provided much support to LM Processing operation subcontracted to ICL ICLs Knowledge Pool produced the training material

25 25 Census Occupational Coding 1981 to 2001 2001 Census - Occupation coding screen Image of census form Job title on record Qualifications indicator box CodeUnit group title Choice list Accept Industry codeSIC group title Not codeableTo expert Enter text for search Search

26 26 2001 Census - Occupation Coding Job title on record= Cellzzman Industry code on record= 51 Text enteredby coder= CELLARMAN wine SOCSICText 9149159Cellarman 914951Cellarman 8111159Cellarman 9225551Cellarman. 9225BAR CELLARMAN 9225BAR/CELLAR SUPERVISOR 9225BAR STAFF/CELLARPERSON Census Occupational Coding 1981 to 2001

27 27 Number of occupation coding queries 1981 - 37,000Apparently too few 1991 - 175,000 (in 54 metal trays on three trolleys) 2001 - 33,000As sent to ONS Revising the coding index during processing 1981 1991 2001 Number of times the index was revised 6 4 10 Total number of changes 131 393 311 Census Occupational Coding 1981 to 2001

28 28 Independent quality control reported 1981 Census - 4.9% error rate 1991 Census - 5.5% error rate 2001Census Contract specified as acceptable 12.0% error rate Lockheed Martin reported 8.9% error rate ONS assessed from sight checking 10.96% error rate Automatic coding throughput 72.2% Census Occupational Coding 1981 to 2001


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