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C. Humphrey1 Data Extractors Summary of Features Delivery Strategies Best Practices.

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Presentation on theme: "C. Humphrey1 Data Extractors Summary of Features Delivery Strategies Best Practices."— Presentation transcript:

1 C. Humphrey1 Data Extractors Summary of Features Delivery Strategies Best Practices

2 C. Humphrey2 Summary of Features Study selection methods Variable selection methods Case selection methods Methods of downloading or retrieving subsets Simple analysis capabilities

3 C. Humphrey3 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 C. Humphrey4 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 C. Humphrey5 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 C. Humphrey6 Methods of Retrieval use of an ftp site, anonymous or logon download from a Web page

7 C. Humphrey7 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 C. Humphrey8 Delivery Strategies full client application a helper application or plug-in CGI and database applications a network programming application

9 C. Humphrey9 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 C. Humphrey10 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 C. Humphrey11 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 C. Humphrey12 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 C. Humphrey13 Best Practices modularity based on standards easy to migrate portable off-the-shelf

14 C. Humphrey14 Best Practices modularity a system of single-tasked utilities that communicate easily among themselves

15 C. Humphrey15 Best Practices based on standards accepted practices for organizing and building systems the communication among modules depends on standards

16 C. Humphrey16 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 C. Humphrey17 Best Practices portable easily used with a variety of systems, including MS/Windows, Unix and MacOS

18 C. Humphrey18 Best Practices off-the-shelf acquire components that are commercially produced

19 C. Humphrey19 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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