TY  - BOOK
AU  - Shea,John
ED  - National Bureau of Economic Research.
TI  - Instrument Relevance in Multivariate Linear Models: A Simple Measure 
T2  - NBER technical working paper series
PY  - 1996///
CY  - Cambridge, Mass.
PB  - National Bureau of Economic Research
N1  - March 1996; Hardcopy version available to institutional subscribers
N2  - The correlation between instruments and explanatory variables is a key determinant of the performance of the instrumental variables estimator.  The R-squared from regressing the explanatory variable on the instrument vector is a useful measure of relevance in univariate models, but can be misleading when there are multiple endogenous variables.  This paper proposes a computationally simple partial R- squared measure of instrument relevance for multivariate models
UR  - https://www.nber.org/papers/t0193
UR  - http://dx.doi.org/10.3386/t0193
ER  -