Can anyone confirm the formula for the m out of n bootstrap variance estimator? rq.boot applies a deflation factor directly to the bootstrap estimates. Presumably, the SE of the estimate of interest is then taken to be the SD of the deflated estimates. I have read Bickel's and others' papers on this subject but have not seen an explicit formula provided for the m out n variance estimator. -- James W. Shaw, Ph.D., Pharm.D., M.P.H. Assistant Professor Department of Pharmacy Administration College of Pharmacy University of Illinois at Chicago 833 South Wood Street, M/C 871, Room 266 Chicago, IL 60612 Tel.: 312-355-5666 Fax: 312-996-0868 Mobile Tel.: 215-852-3045