CG                      Cockroft and Gault equation
CKDEpi.creat            CKD-EPI equation for serum creatinine
CKDEpi.creat.cys        CKD-EPI equation for creatinine and cystatin C
CKDEpi.cys              CKD-EPI equation for cystatin C
MDRD4                   Four-parameter MDRD study equation
MDRD6                   Six-parameter MDRD study equation
Stevens.creat.cys       Stevens' formula for a combination of serum
                        creatinine and cystatin C
Stevens.cys1            GFR estimation using serum cystatin C
Stevens.cys2            Stevens' formula for serum cystatin C, age, and
                        sex
Virga                   Virga's formula
nephro-package          Biostatistics Utilities for Nephrology
