|
Score
|
Proxy
|
Empirical
|
Method
|
Validation
|
|
4
|
An exact measure of
the desired quantity
|
Controlled experiments
and large sample direct mmts
|
Best available practice
in well established discipline
|
Compared with independent
mmts of the same variable over long domain
|
|
3
|
Good fit or measure
|
Historical/field data
uncontrolled experiments small sample direct mmts
|
Reliable method common
within est. discipline Best available practice in immature discipline
|
Compared with independent
mmts of closely related variable over shorter period
|
|
2
|
Well correlated but
not measuring the same thing
|
Modelled/derived data
Indirect mmts
|
Acceptable method
but limited consensus on reliability
|
Measurements not independent
proxy variable limited domain
|
|
1
|
Weak correlation but
commonalities in measure
|
Educated guesses indirect
approx. rule of thumb est.
|
Preliminary methods
unknown reliability
|
Weak and very indirect
validation
|
|
0
|
Not correlated and
not clearly related
|
crude speculation
|
No discernible rigour
|
No validation performed
|
