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An analysis dataset that follows the ADaM Basic Data Structure (BDS), BDS (i.e., an analysis dataset of the BDS class, ) can contain multiple analysis parameters. In a BDS analysis dataset, the variable PARAM contains a unique description for every analysis parameter included in that dataset. The variable PARAMCD contains the short name of the analysis parameter in PARAM, with a one-to-one mapping between the two 2 variables. Each value of PARAM identifies a set of one 1 or more rows in the dataset.

...

A particular value of PARAMCD in the PARAMETER IDENTIFIER for a variable indicates that the specified metadata for that variable should be considered the metadata applicable to the particular PARAMCD, overriding the specified *DEFAULT* metadata, if any.

How to capture analysis metadata is described in the Define-XML specification.


Metadataspec

Num

AnalysisVariable Metadata Field

Description

1

PARAMETER IDENTIFIER

Contains either:

  • the value of PARAMCD that identifies the analysis parameter to which the variable metadata applies;

...

  • or
  • controlled terminology to indicate groupings of analysis parameters:

*ALL* - Used when the variable metadata applies to all analysis parameters in the dataset.

*DEFAULT* - Used when the variable metadata applies to all analysis parameters in the dataset except for those specifically listed within the metadata.


By referencing the codelist for PARAMCD, the user of the dataset can determine the unique analysis parameter values found in the dataset and is able to determine the analysis parameter-specific attributes and derivation algorithms for each variable when PARAMCD is a specific value.

Note that for the PARAMCD variable, the parameter identifier is “PARAMCD.” The list of values that exist for the variable also serves as an index of the analysis parameters and parameter identifiers included in the analysis dataset.

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