AUC                     Function for AUC with sigmoid estimate
AUC.emp                 Function for AUC when input is X and Y
beta2theta              Function to translate beta into theta, the
                        n-sphere constrain
betahat                 Function for estimating beta using kernal
                        function
gradAUC.Lang            Function for gradient of AUC after applying
                        Lagrange Multiplyer
gradsqr                 The function of grad_square in the GCV
hessAUC                 function for hessian matrix of AUC
nlsolve                 solve nonlinear function
optAUC                  Optimal Combinations of Diagnostic Tests Based
                        on AUC
optAUC-package          Optimal Combinations of Diagnostic Tests Based
                        on AUC
theta2beta              Function to translate theta to beta, the
                        n-sphere constrain
