Day 1: Introduction to multi-level data problems
Day 1: Introduction to multi-level data problems
Day 1: Introduction to multi-level data problems
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The organization of <strong>multi</strong><strong>level</strong> <strong>data</strong><br />
◮ Multi<strong>level</strong> <strong>data</strong> are distinguished by their organization<br />
according <strong>to</strong> <strong>multi</strong><strong>level</strong> identifying units. Examples:<br />
◮ constituency ID<br />
◮ country ID<br />
◮ school ID<br />
◮ There are two basic formats for organizing <strong>data</strong> that are<br />
clustered by identifying units:<br />
wide format two columns of <strong>data</strong> contain the same<br />
information, distinguished by different <strong>level</strong>s<br />
long format different <strong>level</strong>s are themselves variables (in their<br />
own columns
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