When?
PROC SSM in SAS/ETS provides a model-based temporal dis-aggregation (and aggregation) capability. A doc example 16, https://go.documentation.sas.com/?docsetId=etsug&docsetVersion=15.1&docsetTarget=etsug_ssm_examples1... , has an illustration. See if this helps you.
Many people appear to be interested in this post. If you have a particular temporal disaggregation problem please share it with me (privately if you prefer), I will try to provide an SSM based solution.
Rajesh
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