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UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice of data.

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Presentation on theme: "UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice of data."— Presentation transcript:

1 UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice of data editing Doha, State of Qatar, 18-22 May 2008 Data Capture Process Stages

2 UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice of data editing Doha, State of Qatar, 18-22 May 2008 Overview  Objective  Major Process Stages Document Scanning operations Recognizing operations Verifying operations Coding Assistance  Factors/Considerations

3 UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice of data editing Doha, State of Qatar, 18-22 May 2008 Objective  To provide an overview of the major process stages associated with optical data capture and quality assurance considerations

4 UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice of data editing Doha, State of Qatar, 18-22 May 2008 Major Process Stages Document Scanning Recognizing Verifying Coding Assistance Scanner Speeds are dependent on process chosen Recognizing is dependent on the sophistication of the recognition engine Automatic Electronic Verification Non-Successful Electronic Verification Major Process Stages prepare data in a form suitable for entry into computer

5 UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice of data editing Doha, State of Qatar, 18-22 May 2008 Document Scanning Stage Key feature: scanning speed Scanning speed will be determined by:  Quality of the scanner machines  Size of non-drop out color  Paper quality, cleanness & weight

6 UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice of data editing Doha, State of Qatar, 18-22 May 2008 Recognizing Stage The recognizing process is to interpret images Accuracy of interpretation will be determined by:  Recognition engine/memory dictionary;  Configuration threshold

7 UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice of data editing Doha, State of Qatar, 18-22 May 2008 Verifying Stage  Processing can be in geographic order or in random order: Automatic electronic verification Non successful electronic verification: Need to compare the value of the interpreted image with the real image of the form. Image manipulation

8 UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice of data editing Doha, State of Qatar, 18-22 May 2008 Verifying Stage (cont.) Image Manipulation: Electronic questionnaires can be sent to specialist operators then back to the original operator if necessary (in some cases, the same questionnaire can be worked on simultaneously by two or more persons)

9 UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice of data editing Doha, State of Qatar, 18-22 May 2008 Coding Assistance Stage Process in which census questionnaire entries are assigned numerical and/ or alphanumeric values Objective is to prepare data in a form suitable for entry into computer Done by setting up possible responses to each question in the census questionnaire

10 UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice of data editing Doha, State of Qatar, 18-22 May 2008  Questionnaire Design & Preparation  Data Collection & Processing Considerations Field Operation Staff Training Factors to be considered

11 UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice of data editing Doha, State of Qatar, 18-22 May 2008 Thank You

12 UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice of data editing Doha, State of Qatar, 18-22 May 2008  Additional material

13 UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice of data editing Doha, State of Qatar, 18-22 May 2008 Form Design Advise Consider the number items to be included in a form Pre-print codes near the place where the box for ticks are located Considering the speed of the data capture process - it is advisable to use marks or “ticks” as much as possible Define drop out color properly; use registration marks (allows for quicker recognition) Questionnaire Design & Preparation

14 UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice of data editing Doha, State of Qatar, 18-22 May 2008  Form Design Advise Maintain consistent pattern in which the information to be collected will be located Do not disturb the visibility of the ticks and marks with titles, labels or instructions Avoid putting "answers" of one field to another page of the questions; Avoid using open ended questions Questionnaire Design & Preparation

15 UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice of data editing Doha, State of Qatar, 18-22 May 2008 Questionnaire Design & Preparation  How to Obtain Good Results of Scanning Select adequate paper quality Select a reliable printing press Use appropriate ink, considering drop out color (for the questionnaires paper heavier than 80 grams per square meter can help avoid paper crashes in scanner)

16 UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice of data editing Doha, State of Qatar, 18-22 May 2008 Data Collection & Processing Considerations  Field Operation Field Operators should have basic knowledge of the data capture process chosen  Staff Training A set-up of required training for staff will ensure quality and effectiveness of the data captured

17 UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice of data editing Doha, State of Qatar, 18-22 May 2008  Reasons of Error-Reading of OCR: Bad condition of the form because of dirt, folded, crumple, etc Unnecessary lines of characters such as points, decorative strokes, hooks, etc Checking the questionnaires for completeness and consistencies Field Operation Considerations

18 UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice of data editing Doha, State of Qatar, 18-22 May 2008 Training for Processing Staff Installation and set-up break-down of equipment (e.g. hardware and software) Basic software knowledge Scanner operating procedures Troubleshooting (e.g. solutions to common problems/issues)

19 UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice of data editing Doha, State of Qatar, 18-22 May 2008  Control steps should be taken if the information image is partial or no information to assure the quality of generated files Value Checking Steps Control for Blank Missing Questionnaire Control steps

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