wow-inequalities/docs/validity_tool.md

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# Validity estimators
For a general concept description see ../docs/terms_of_reference-key_terms.md#validity
From Maitrot2017 -> Section 4, Figure 3 and Appendix table notes
They rank *only* quasi-experimental/experimental
Do we too?
## internal
0-5 ranking using study design/method:
OLS=2 (ordinary least squares)
DID=3 (difference-in-difference)/(-in-difference)
DM=3 ()
PSM=3.5 (propensity score matching)
IV=4 (instrumental variable)
RD=4.5 (regression discontinuity)
RCT=5
## external
non-representative surveys=2
sub-nationally representative surveys=3
nationally representative surveys=4
surveys based on census data=5