Microcomputer Processing of Census and Surveys (using CSPro)
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Transcript of Microcomputer Processing of Census and Surveys (using CSPro)
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U.S. Census BureauInternational Programs Center
www.census.gov/ipc/www
Microcomputer Processing of
Census and Surveys(using CSPro)
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Data File Design
• How are data stored in the data file?
• What is a case?• What is on a record?• How many records?
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Objectives:
1. Understand elements of a data file2. Describe a field, record, and questionnaire3. Describe data file structures4. Learn how the CSPro data dictionary
defines these elements
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Needed information about data file
• Need identification fields• Need information / data fields• Need “SIZE” [how many characters] • Need valid values/codes
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Data File StructureASCII/text
• ALL data on ONE record/line
• Different types of data on DIFFERENT record/lines
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Data Processing/Data File Terminology
• Item/variable/field• Record• Questionnaire (Case)• Data file
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Item/variable/field
• Is a single piece of information• Has the attributes of:
SizeTypeNumeric/Alphanumeric
Age
5 1SexM
Income- 9 8 7 . 6 5
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Record• a collection of related items forming a single line
of information. For example: • Housing Record
contains information about the house
• Population Record Contains information about each person in the house
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Case/Questionnaire
• all the records of all types for a processing unit such as a household
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A data file is
• a collection of all the questionnaires (cases)
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CSPro Data Dictionary
1. Field names/labels2. Field size3. Field location4. Field attributes5. Record names6. Record types7. Records ID’s8. Records allowed by type
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Questionnaire sections
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One Section ==> One record
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From the questionnaire to the data file
(one record type)
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From the questionnaire to the data file
(What are the data?)
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From the questionnaire to the data file
(Where are the data?)
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Data Dictionary describes the data file