Data Capture Process Stages UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice.
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Transcript Data Capture Process Stages UNSD-ESCWA Regional Workshop on Census Data Processing in the ESCWA region: Contemporary technologies for data capture, methodology and practice.
Data Capture
Process Stages
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
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
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
Scanner Speeds are dependent on process chosen
Document Scanning
Recognizing
Recognizing is dependent on the sophistication of
the recognition engine
Automatic Electronic Verification
Verifying
Non-Successful Electronic Verification
Coding Assistance
prepare data in a form
suitable for entry into
computer
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
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
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
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)
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
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
Factors to be considered
Questionnaire Design & Preparation
Data Collection & Processing Considerations
Field Operation
Staff Training
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
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
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
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)
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
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
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)
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
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
Field Operation Considerations
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
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)
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
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
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