International Survey Of Upper Secondary Schools: Technical by Organisation for Economic Co-Operation and Development

By Organisation for Economic Co-Operation and Development

Booklet by means of corporation for financial Co-Operation and improvement

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There were eventual deviations from the negotiated schedules, but the system allowed all data processing to be done by the international co-ordinator. Moreover, the system proved to have advantages later in the iterative cleaning and editing processes because late data entries and edit changes could be added to the database. The data files were then submitted to the OECD international co-ordinator for cleaning and verification. The major responsibilities of the OECD were to check that the data files received matched the international standard and to request modifications as necessary to bring them into compliance.

In almost all cases, corrections to the data were done by the country using the data cleaning module. In some cases, countries asked for help in making changes to individual school or programme data entries. In all cases where OECD made any change to a country’s data, a data validation report was sent to the country along with an updated cleaning programme with the newly edited data. NPMs were asked to verify that the changes had been made in accordance with their instructions. 8 Iterative data cleaning process Country database file Cleaned country database Data cleaning program (OECD provided: ACCESS 97 ACCESS 2000 ACCESS XP) and data validation report OECD review Country edit (or re-edit) Optional: Spreadsheet conversions for those countries without ACCESS 97, ACCESS 2000 or ACCESS XP.

There were consistency and range checks to verify the accuracy and completeness of the data. indd 38 © OECD2004 5/02/04, 18:18:54 The Data Collection PART II module included editing capabilities and report generators to produce data validity reports and summary information to be used to pinpoint possible data errors. The kinds of checks in the data cleaning module were generally of the following sort: • Codebook format checks: Conformity to coding of variable names and locations; • Range checks: - Allowable values for each item with a Yes/No response; and - Reasonable ranges for each item with numeric data response.

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