I want to check with "nearc4" is a good candidate instrument for "educ". I know that for it to be a good candidate it has to be correlated with the "educ". How can I see from my regression if these 2 variables are correlated?

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closed as off-topic by Michael Chernick, Christoph Hanck, Peter Flom Feb 8 at 12:07

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  • $\begingroup$ Regression output doesn't tell you anything directly about correlations among regressors. Is there are reason you aren't simply computing the correlation coefficients among the regressors? (BTW, even that isn't appropriate for multiple regression, because the issue isn't whether a regressor is correlated with the response: it's whether the regressor, after taking out all the effects on the response of all other variables, has any linear association with the residuals.) $\endgroup$ – whuber Feb 7 at 21:09