R estimators based on the joint ranks (JR) of all the residuals have been developed over the last 20 years for fitting linear models with independently distributed errors. In this article, we extend ...

The former is implemented in Plink and uses a sandwich correction to correct the standard errors for model misspecification of ignoring the clustering.

Christopher Zorn, Comparing GEE and Robust Standard Errors for Conditionally Dependent Data, Political Research Quarterly, Vol. 59, No. 3 (Sep., 2006), pp. 329-341 ...