okfn/openspending — Issue #284: Measure fields in data model v2 including normalization
Author: rgrp
Created: 2011-11-02 10:14:15+00:00
State: open

Proposed rule: Measures must be in a unit of account. Why: measure must be aggregatable and thus need to be in same currency (and possibly point in time)

E.g. unit of account: USD in 2000

### Option 1

Measures:

* amount **constant across the dataset consistent with rule**. Not necessarily normalized by time.
* Currrency for this measure specified in dataset metadata cf #252
* amount_normalized = normalized by time (and possibly PPP) [could be filled later]

[optional]: entries get dimension

* amount_original
* amount_original_currency

### Options 2

Measure:

* amount = amount normalized by currency, time, ppp (and we can convert). 2000 USD PPP

All datasets also get dimension

* amount_original
* amount_original_currency