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#' Predict the CSTE curve of new data for binary outcome.
#'
#' Predict the CSTE curve of new data for binary outcome.
#'
#'
#'@param obj a S3 class of cste.
#'@param newx samples of covariates which is a \eqn{m*p} matrix.
#'
#'@return A S3 class of cste which includes
#' \itemize{
#' \item \code{g1}: predicted \eqn{g_1(X\beta_1)}.
#' \item \code{g2}: predicted \eqn{g_2(X\beta_2)}.
#' \item \code{B1}: the B-spline basis for estimating \eqn{g_1}.
#' \item \code{B2}: the B-spline basis for estimating \eqn{g_2}.
#' }
#'
#' @references
#' Guo W., Zhou X. and Ma S. (2021).
#' Estimation of Optimal Individualized Treatment Rules
#' Using a Covariate-Specific Treatment Effect Curve with
#' High-dimensional Covariates,
#' \emph{Journal of the American Statistical Association}, 116(533), 309-321
#'
#' @seealso \code{\link{cste_bin}}
predict_cste_bin <- function(obj, newx) {
# type <- match.arg(type)
if(missing(newx)) {
out <- obj$B1 %*% obj$delta1
newB <- NULL
} else {
u1 <- pu(newx, obj$beta1)
u2 <- pu(newx, obj$beta2)
eta1 <- u1$u
newB <- bsplineS(eta1, breaks = quantile(eta1, obj$knots))
g1 <- newB %*% obj$delta1
eta2 <- u2$u
newB2 <- bsplineS(eta2, breaks = quantile(eta2, obj$knots))
g2 <- newB2 %*% obj$delta2
}
return(list(g1 = g1, g2 = g2, B1 = newB, B2 = newB2))
}
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