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Data Extractors

Data Extractors. Summary of Features Delivery Strategies Best Practices. Summary of Features. Study selection methods Variable selection methods Case selection methods Methods of downloading or retrieving subsets Simple analysis capabilities. Study Selection Methods.

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Data Extractors

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  1. Data Extractors • Summary of Features • Delivery Strategies • Best Practices

  2. Summary of Features • Study selection methods • Variable selection methods • Case selection methods • Methods of downloading or retrieving subsets • Simple analysis capabilities

  3. Study Selection Methods • simple an extractor for a single study • list of study titles or titles organized by subject headings • a searchable catalogue of titles or variables within studies

  4. Variable Selection Methods • list of variable names • a subject index linked to a list of variables Either may include the data dictionary entry for individual variables.

  5. Case Selection Methods • a set of pre-selected demographic variables • declare through Boolean expressions using variables within a study • through a random selection of cases

  6. Methods of Retrieval • use of an ftp site, anonymous or logon • download from a Web page

  7. Simple Analysis Capabilities • frequency distributions or descriptive statistics for individual variables • simple tables of two-way tabulations or descriptive summaries • simple charts or graphs

  8. Delivery Strategies • full client application • a helper application or plug-in • CGI and database applications • a network programming application

  9. Delivery Strategies • full client application • independent program written to communicate with a specific server • advantage: the client has complete communication control with the server • disadvantage: the development costs to program and support a full client

  10. Delivery Strategies • a helper application or plug-in • an application operating in conjunction with a Web browser • advantage: the Web browser handles the network communication • disadvantage: the development costs to program and support the application

  11. Delivery Strategies • CGI and database applications • the use of Web forms to drive database requests • advantage: the Web browser handles the network communication and supports multiple platforms • disadvantage: feeding and caring the database needs standard products

  12. Delivery Strategies • a network programming application • network-programs operating with a Web browser • advantage: the same Web advantages as before plus added functionality • disadvantage: same database concerns as before plus the costs of programming

  13. Best Practices • modularity • based on standards • easy to migrate • portable • off-the-shelf

  14. Best Practices • modularity • a system of single-tasked utilities that communicate easily among themselves

  15. Best Practices • based on standards • accepted practices for organizing and building systems • the communication among modules depends on standards

  16. Best Practices • easy to migrate • easily adapt with changes in new technology • primarily, the data documentation and data must outlive current software and hardware

  17. Best Practices • portable • easily used with a variety of systems, including MS/Windows, Unix and MacOS

  18. Best Practices • off-the-shelf • acquire components that are commercially produced

  19. Directions to Take • CARL CFI proposal • phone conference Tuesday, Nov 30 • Future Directions for DLI • moving from a pilot project to a permanent program • Strategies for COPPUL

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