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...apply(split(x,group),scale),group) I would appreciate your help. Ashraf -----------------______________________________________ M. Ashraf Chaudhary, Ph.D. Associate Scientist/Biostatistician Department of International Health Johns Hopkins Bloomberg School of Public Health 615 N. Wolfe St. Room W5506 Baltimore MD 21205-2179 (410) 502-0741/fax: (410) 502-6733 <mailto:mchaudha@jhsph.edu> mchaudha@jhsph.edu Web:http://faculty.jhsph.edu/?F=Mohammad&L=Chaudhary [[alternative HTML version deleted]]

...problem. Regards, Ashraf ___________________________________ M. Ashraf Chaudhary, Ph.D. Associate Scientist/Biostatistician Department of International Health Disease Prevention and Control Program Johns Hopkins University Bloomberg School of Public Health 615 North Wolfe Street, Room W5506 Baltimore MD 21205 mchaudha@jhsph.edu Phone: (410) 502-0741/Fax: (410) 502-6733 http://faculty.jhsph.edu/?F=Mohammad&L=Chaudhary [[alternative HTML version deleted]]

...irth is 0 as it is a centered variable within familyid. I appreciate your pointing me to the source of the problem. Ashraf _________________________________ M. Ashraf Chaudhary, Ph.D. Department of International Health Johns Hopkins Bloomberg School of Public Health 615 N. Wolfe St. Room W5506 Baltimore MD 21205-2179 (410) 502-0741/fax: (410) 502-6733 mchaudha@jhsph.edu <mailto:mchaudha@jhsph.edu> [[alternative HTML version deleted]]

I am trying to find out if R can recognize specific criteria for removing rows (i.e. a prexisting function) I have a matrix myMatrix that is 12000 by 20 I would like to remove rows from myMatrix that have: -999 across all columns -999 across all columns but one -999 across all columns but two -999 across all columns but three -999 across all columns but four -999 across all columns but five

...lmatch1[ii,] clmatch2 clogit(case~scc+agescc+strata(age),data=clmatch2) -----------------______________________________________ M. Ashraf Chaudhary, Ph.D. Associate Scientist/Biostatistician Department of International Health Johns Hopkins Bloomberg School of Public Health 615 N. Wolfe St. Room W5506 Baltimore MD 21205-2179 (410) 502-0741/fax: (410) 502-6733 mchaudha at jhsph.edu Web:http://faculty.jhsph.edu/?F=Mohammad&L=Chaudhary

...11,sk21,skR,R1,n.cp,f.cp,nb.cp,b.cp,s.cp,p.cp,bca.cp) NULL data frame with 0 rows _________________________________ M. Ashraf Chaudhary, Ph.D. Assisociate Scientist/Biostatistician Department of International Health Johns Hopkins Bloomberg School of Public Health 615 N. Wolfe St. Room W5506 Baltimore MD 21205-2179 (410) 502-0741/fax: (410) 502-6733 mchaudha@jhsph.edu Web:http://faculty.jhsph.edu/?F=Mohammad&L=Chaudhary [[alternative HTML version deleted]]