![]() ![]() Load data into the base dictionary and activate the data see "Loading a Dictionary". To set up a virtual dictionary in TMS, choose a base dictionary (and activate it, if the base dictionary is still provisional), define the virtual dictionary's name and cut-off date, and assign the virtual dictionary to a domain (see "Assigning a Dictionary to a Domain").ĭefine and activate the base dictionary on which you want to base the virtual dictionary see "Defining a Dictionary" and set it to active see "Setting the Dictionary's Status to Active". ![]() Virtual dictionaries can only be based on a single, active base dictionary, from which the virtual dictionary inherits its definition. You can also use virtual dictionaries to view the state of a dictionary's terms and relations for any date in that dictionary's history. Using a virtual dictionary enables you to continue coding verbatim terms for a clinical study against one version of a dictionary while the base dictionary changes. These dictionaries are useful for studies that require the most up-to-date dictionary information.īy contrast, virtual dictionaries have defined cut-off dates, after which no dictionary terms can be added. You can define named relations between terms in the same or different levels of a weak dictionary, as business needs dictate.īase dictionaries usually contain the latest dictionary and verbatim terms, because they are updated on an ongoing basis. (Do not define level relations as you do in strong dictionaries.) If your dictionary is a single dynamic dictionary, define a single dictionary level for it. If your dictionary is really a collection of dynamic dictionaries, you can define a TMS dictionary level for each component dictionary and fully define the dynamic dictionary within that level. TMS requires that each dictionary definition have at least one level to contain dictionary terms. Dictionaries with this characteristic are called dynamic. In fact, all of the terms (1 through 6) are on the same level, and the length of the hierarchical chain is unlimited. In the above example, the number of terms that can be linked in a hierarchical chain is not limited by the number of levels. For example, you can use the named relation Narrower term to link the terms "aspirin" and "pain reliever," or the named relation Is part of to define a hierarchical series of relations as follows: ![]() Named relations describe the connection between terms. The hierarchical structure of the dictionary is defined by the relationships permitted and used in the dictionary. For example, a strong dictionary with four levels from the coding level to the highest derivation level will only have four terms in a hierarchical chain:Ī weak dictionary does not depend on dictionary levels to identify the hierarchy. Where strong dictionaries have fixed hierarchies, represented by levels, weak dictionary have dynamic hierarchies, which are variable. TMS supports these with weak dictionaries and named relations between terms. Some external dictionaries, such as SNOMED, require a different type of structure, one that is dynamically created by relations between terms. ![]()
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