Date post: | 19-Dec-2015 |
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Once there was a mild mannered DDI 1.0 variable
<var ID="V11" name="V11" catQnty="2"><location StartPos="25" EndPos="25" width="1" RecSegNo="1" fileid="WLT1"/><qstn ID="Q5" seqNo="4"><qstnLit>What country were you born in?</qstnLit></qstn><labl level="var">Nativity</labl><catgry ID="CV11_1"><catValu>1</catValu><labl level="catgry">Native</labl><catStat type=“freq”>798920</catStat></catgry><catgry ID="CV11_2"><catValu>2</catValu><labl level="catgry">Foreign</labl><catStat type=“freq”>210023</catStat></catgry><concept source="archive">Place_of_Birth</concept><derivation><drvdesc>If US code as 1, else code as 2</drvdesc></derivation></var>
It was well contained and kept close to home
<var ID="V11" name="V11" catQnty="2"><location StartPos="25" EndPos="25" width="1" RecSegNo="1“ fileid="WLT1"/><qstn ID="Q5" seqNo="4"><qstnLit>What country were you born in?</qstnLit></qstn><labl level="var">Nativity</labl><catgry ID="CV11_1"><catValu>1</catValu><labl level="catgry">Native</labl><catStat type=“freq”>798920</catStat></catgry><catgry ID="CV11_2"><catValu>2</catValu><labl level="catgry">Foreign</labl><catStat type=“freq”>210023</catStat></catgry><concept source="archive">Place_of_Birth</concept><derivation><drvdesc>If US code as 1, else code as 2</drvdesc></derivation></var>
It was well contained and kept close to home
<var ID="V11" name="V11" catQnty="2"><location StartPos="25" EndPos="25" width="1" RecSegNo="1“ fileid="WLT1"/><qstn ID="Q5" seqNo="4"><qstnLit>What country were you born in?</qstnLit></qstn><labl level="var">Nativity</labl><catgry ID="CV11_1"><catValu>1</catValu><labl level="catgry">Native</labl><catStat type=“freq”>798920</catStat></catgry><catgry ID="CV11_2"><catValu>2</catValu><labl level="catgry">Foreign</labl><catStat type=“freq”>210023</catStat></catgry><concept source="archive">Place_of_Birth</concept><derivation><drvdesc>If US code as 1, else code as 2</drvdesc></derivation></var>
It was well contained and kept close to home
<var ID="V11" name="V11" catQnty="2"><location StartPos="25" EndPos="25" width="1" RecSegNo="1“ fileid="WLT1"/><qstn ID="Q5" seqNo="4"><qstnLit>What country were you born in?</qstnLit></qstn><labl level="var">Nativity</labl><catgry ID="CV11_1"><catValu>1</catValu><labl level="catgry">Native</labl><catStat type=“freq”>798920</catStat></catgry><catgry ID="CV11_2"><catValu>2</catValu><labl level="catgry">Foreign</labl><catStat type=“freq”>210023</catStat></catgry><concept source="archive">Place_of_Birth</concept><derivation><drvdesc>If US code as 1, else code as 2</drvdesc></derivation></var>
It was well contained and kept close to home
<var ID="V11" name="V11" catQnty="2"><location StartPos="25" EndPos="25" width="1" RecSegNo="1“ fileid="WLT1"/><qstn ID="Q5" seqNo="4"><qstnLit>What country were you born in?</qstnLit></qstn><labl level="var">Nativity</labl><catgry ID="CV11_1"><catValu>1</catValu><labl level="catgry">Native</labl><catStat type=“freq”>798920</catStat></catgry><catgry ID="CV11_2"><catValu>2</catValu><labl level="catgry">Foreign</labl><catStat type=“freq”>210023</catStat></catgry><concept source="archive">Place_of_Birth</concept><derivation><drvdesc>If US code as 1, else code as 2</drvdesc></derivation></var>
It was well contained and kept close to home
<var ID="V11" name="V11" catQnty="2"><location StartPos="25" EndPos="25" width="1" RecSegNo="1“ fileid="WLT1"/><qstn ID="Q5" seqNo="4"><qstnLit>What country were you born in?</qstnLit></qstn><labl level="var">Nativity</labl><catgry ID="CV11_1"><catValu>1</catValu><labl level="catgry">Native</labl><catStat type=“freq”>798920</catStat></catgry><catgry ID="CV11_2"><catValu>2</catValu><labl level="catgry">Foreign</labl><catStat type=“freq”>210023</catStat></catgry><concept source="archive">Place_of_Birth</concept><derivation><drvdesc>If US code as 1, else code as 2</drvdesc></derivation></var>
It was well contained and kept close to home
<var ID="V11" name="V11" catQnty="2"><location StartPos="25" EndPos="25" width="1" RecSegNo="1" fileid="WLT1"/><qstn ID="Q5" seqNo="4"><qstnLit>What country were you born in?</qstnLit></qstn><labl level="var">Nativity</labl><catgry ID="CV11_1"><catValu>1</catValu><labl level="catgry">Native</labl><catStat type=“freq”>798920</catStat></catgry><catgry ID="CV11_2"><catValu>2</catValu><labl level="catgry">Foreign</labl><catStat type=“freq”>210023</catStat></catgry><concept source="archive">Place_of_Birth</concept><derivation><drvdesc>If US code as 1, else code as 2</drvdesc></derivation></var>
It was well contained and kept close to home
<var ID="V11" name="V11" catQnty="2"><location StartPos="25" EndPos="25" width="1" RecSegNo="1" fileid="WLT1"/><qstn ID="Q5" seqNo="4"><qstnLit>What country were you born in?</qstnLit></qstn><labl level="var">Nativity</labl><catgry ID="CV11_1"><catValu>1</catValu><labl level="catgry">Native</labl><catStat type=“freq”>798920</catStat></catgry><catgry ID="CV11_2"><catValu>2</catValu><labl level="catgry">Foreign</labl><catStat type=“freq”>210023</catStat></catgry><concept source="archive">Place_of_Birth</concept><derivation><drvdesc>If US code as 1, else code as 2</drvdesc></derivation></var>
By 2.1 it has gotten a bit bolder
• You could arrange the variables into nCubes creating multidimensional structures
• It now had an optional place to put data location information
• In allowed for more explicit nesting and category structure
Modularity ruled!
• Concepts were captured early
• Questions developed and linked to concepts
• Categories were defined…• …and grouped into specific
relationships• Variables were created
using these category groups• Data storage was designed• Physical instances of data
files were created and summary statistics calculated
Implications for creating documentation• You can create in the order that
information becomes available• You can reuse pieces and imply
relationships• Support community wide concept,
question, category and variable banks• Create new physical instances or
formats without changing other modules
It requires
• Thinking about a variable as a development process rather than as an artifact
• New tools to facilitate information capture and create the appropriate links
Categories
• Individual labels and definitions• Comparability is by definition NOT
by label• Can be used by multiple Category
Groups
Category Groups
• A category group is made up of 1 or more categories
• Flat – no hierarchies• Hierarchical - Levels
• Regular• Irregular
• Provides specific category codes
Variable construction
• Variable• No categories
• Ranges• Open
• Category Groups• Full• Level• Discrete• Range• Cherry pick
NCube
• They grew up, got a capital N• Still composed of one or more
variables• Provide for multiple measures• Gained features to make them
comparable to SDMX structures