Long Data Format
Long Data Format is a tabular representation of time series Risk Data that records the states (measurements) of multiple entities. Its defining characteristic is that each table row contains data pertaining to one entity at one point in time.
An alternative representation of the same data is the Wide Data Format.
Relational Database Context
In the context of relational models of databases the combination of the Entity ID and the Event Time is the minimal set of attributes that forms a Primary Key for the relation
- Tidy Data, H.Wickham, Journal of Statistical Software
Open Source Implementations
Working with long data formats in possible in many open source python and R packages. For transition phenomena: