Meaning of CDISC Basic Data Structure Dataset
An ADaM BDS dataset contains one or more records per subject, per analysis parameter, per analysis time point. Variables include the value being analyzed (e.g., AVAL) and the description of the value being analyzed (e.g., PARAM). Other variables in the dataset provide more information about the value being analyzed (e.g., the subject identification) or describe and trace the derivation of it (e.g., DTYPE) or support the analysis of it (e.g., treatment variables, covariates).
Source: http://evs.nci.nih.gov/ftp1/CDISC/SDTM/SDTM%20Terminology.xls
Web site to visit: http://evs.nci.nih.gov
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