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- W2014750400 abstract "Non-interventional or observational research is often based on existing data, which has been collected over an extended period of time. When the nature of the research requires the examination of a large number of variables, the increased volume of data renders its exploration and understanding a more difficult task. More important, the quality of any analysis is dependent upon the availability of data over time. The aims of this paper are: to communicate the need for a graphical approach when evaluating the completeness of longitudinal data; to demonstrate how we arrived at a SAS/GRAPH® based solution to addressing this need in our project – the patient profile plots (PPPs) and centre profile plots (CPPs); to demonstrate the application of our approach in other settings; to explain the programming principles behind the PPPs and CPPs; and finally, to place PPPs and CPPs in the context of other graphical approaches and discuss their strengths and limitations. PPPs and CPPs are novel SAS based graphical tools that allow the investigator to evaluate the completeness of longitudinal data in a simple, easy to use graphical approach." @default.
- W2014750400 created "2016-06-24" @default.
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- W2014750400 date "2009-12-01" @default.
- W2014750400 modified "2023-10-17" @default.
- W2014750400 title "A SAS®based graphical approach to examine the completeness of longitudinal data: patient profile plots (PPPs) and centre profile plots (CPPs)" @default.
- W2014750400 doi "https://doi.org/10.1179/175709209x12549917603607" @default.
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