[DDI-ADG] time pieces in V 2.0

[Sanda Ionescu]

Section 2, Study Description:

2.2.3.1 <timePrd event="" date="" cycle="">

Tag Library description and examples:
Description: The time period to which the data refer. This item reflects 
the time period covered by the data, not the dates of coding or making 
documents machine-readable or the dates the data were collected. Also known 
as span. Use the event attribute to specify "start", "end", or "single" for 
each date entered. The ISO standard for dates (YYYY-MM-DD) is recommended 
for use with the "date" attribute. The "cycle" attribute permits 
specification of the relevant cycle, wave, or round of data. Maps to Dublin 
Core Coverage element. Inclusion of this element is recommended.

Example(s):
<timePrd event="start" date="1998-05-01">May 1, 1998</timePrd>
<timePrd event="end" "date=1998-05-31">May 31, 1998</timePrd>

2.2.3.2 <collDate event="" date="" cycle="">

Description: Contains the date(s) when the data were collected. Use the 
event attribute to specify "start", "end", or "single" for each date 
entered. The ISO standard for dates (YYYY-MM-DD) is recommended for use 
with the "date" attribute. The "cycle" attribute permits specification of 
the relevant cycle, wave, or round of data. Maps to Dublin Core Coverage 
element. Inclusion of this element in the codebook is recommended.

Example(s):
<collDate event="single" date="1998-11-10">10 November 1998</collDate>


2.3.1.1 <timeMeth method="">

Description: The time method or time dimension of the data collection. The 
"method" attribute is included to permit the development of a controlled 
vocabulary for this element.

Example(s):
<timeMeth>panel survey</timeMeth>
<timeMeth>cross-section</timeMeth>
<timeMeth>trend study</timeMeth>
<timeMeth>time-series</timeMeth>

2.3.1.3 <frequenc freq="">

Description: For data collected at more than one point in time, the 
frequency with which the data were collected. The "freq" attribute is 
included to permit the development of a controlled vocabulary for this 
element.

Example(s):
<freq>monthly</freq>
<freq>quarterly</freq>

4.3 <var temporal="">

The attribute "temporal" indicates whether the variable relays time-related 
information. (Currently set as Y|N with N as a default).

[Aside from these, of course,  we have the various dates in citation, but 
those are "administrative" rather than study-related information].

Sanda.




Sanda Ionescu,
Research Associate
Inter-university Consortium for Political and Social Research (ICPSR)
The University of Michigan
P.O. Box 1248
Ann Arbor, MI 48106

Phone: (734) 615-7890
Fax: (734) 615-7890
        (734) 647-8200