diff --git a/NAMESPACE b/NAMESPACE
index 67ecafc0..c50d947a 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -13,6 +13,8 @@ S3method(PKNCAdose,tbl_df)
 S3method(as.data.frame,PKNCAconc)
 S3method(as.data.frame,PKNCAdose)
 S3method(as.data.frame,PKNCAresults)
+S3method(dplyr::group_vars,PKNCAconc)
+S3method(dplyr::group_vars,PKNCAdose)
 S3method(exclude,default)
 S3method(filter,PKNCAconc)
 S3method(filter,PKNCAdose)
@@ -22,6 +24,9 @@ S3method(formula,PKNCAdose)
 S3method(full_join,PKNCAconc)
 S3method(full_join,PKNCAdose)
 S3method(full_join,PKNCAresults)
+S3method(getDataName,PKNCAconc)
+S3method(getDataName,PKNCAdose)
+S3method(getDataName,PKNCAresults)
 S3method(getDepVar,PKNCAconc)
 S3method(getDepVar,PKNCAdose)
 S3method(getGroups,PKNCAconc)
@@ -35,6 +40,9 @@ S3method(group_by,PKNCAresults)
 S3method(inner_join,PKNCAconc)
 S3method(inner_join,PKNCAdose)
 S3method(inner_join,PKNCAresults)
+S3method(is_sparse_pk,PKNCAconc)
+S3method(is_sparse_pk,PKNCAdata)
+S3method(is_sparse_pk,PKNCAresults)
 S3method(left_join,PKNCAconc)
 S3method(left_join,PKNCAdose)
 S3method(left_join,PKNCAresults)
diff --git a/R/class-PKNCAconc.R b/R/class-PKNCAconc.R
index ff206cba..bb2a4bbc 100644
--- a/R/class-PKNCAconc.R
+++ b/R/class-PKNCAconc.R
@@ -203,6 +203,7 @@ formula.PKNCAconc <- function(x, ...) {
 #' order.
 #' @export
 #' @importFrom stats model.frame
+#' @method model.frame PKNCAconc
 model.frame.PKNCAconc <- function(formula, ...) {
   formula$data[, all.vars(formula$formula), drop=FALSE]
 }
@@ -265,6 +266,7 @@ group_vars.PKNCAconc <- function(x) {
 }
 
 #' @rdname getDataName
+#' @export
 getDataName.PKNCAconc <- function(object) {
   if (is_sparse_pk(object)) {
     "data_sparse"
@@ -364,6 +366,7 @@ print.PKNCAconc <- function(x, n=6, summarize=FALSE, ...) {
 }
 
 #' @rdname is_sparse_pk
+#' @export
 is_sparse_pk.PKNCAconc <- function(object) {
   "data_sparse" %in% names(object)
 }
diff --git a/R/class-PKNCAdata.R b/R/class-PKNCAdata.R
index 95b44afb..9f7ab6de 100644
--- a/R/class-PKNCAdata.R
+++ b/R/class-PKNCAdata.R
@@ -191,6 +191,7 @@ PKNCAdata.default <- function(data.conc, data.dose, ...,
 }
 
 #' @rdname is_sparse_pk
+#' @export
 is_sparse_pk.PKNCAdata <- function(object) {
   is_sparse_pk(object$conc)
 }
diff --git a/R/class-PKNCAdose.R b/R/class-PKNCAdose.R
index 2ae2f271..10d0d12f 100644
--- a/R/class-PKNCAdose.R
+++ b/R/class-PKNCAdose.R
@@ -50,12 +50,14 @@ PKNCAdose <- function(data, ...)
 
 #' @rdname PKNCAdose
 #' @export
-PKNCAdose.default <- function(data, ...)
+PKNCAdose.default <- function(data, ...) {
   PKNCAdose.data.frame(as.data.frame(data), ...)
+}
 #' @rdname PKNCAdose
 #' @export
-PKNCAdose.tbl_df <- function(data, ...)
+PKNCAdose.tbl_df <- function(data, ...) {
   PKNCAdose.data.frame(as.data.frame(data), ...)
+}
 
 #' @rdname PKNCAdose
 #' @export
@@ -242,6 +244,7 @@ formula.PKNCAdose <-  function(x, ...) {
 #' @rdname model.frame.PKNCAconc
 #' @export
 #' @importFrom stats model.frame
+#' @method model.frame PKNCAdose
 model.frame.PKNCAdose <- function(formula, ...) {
   cbind(getDepVar.PKNCAdose(formula),
         getIndepVar.PKNCAdose(formula),
@@ -281,8 +284,10 @@ group_vars.PKNCAdose <- function(x) {
 }
 
 #' @rdname getDataName
-getDataName.PKNCAdose <- function(object)
+#' @export
+getDataName.PKNCAdose <- function(object) {
   "data"
+}
 
 #' @rdname print.PKNCAconc
 #' @export
diff --git a/R/class-PKNCAresults.R b/R/class-PKNCAresults.R
index 238b8cd1..aa4cdfa5 100644
--- a/R/class-PKNCAresults.R
+++ b/R/class-PKNCAresults.R
@@ -59,11 +59,13 @@ as.data.frame.PKNCAresults <- function(x, ..., out.format=c('long', 'wide')) {
 }
 
 #' @rdname getDataName
+#' @export
 getDataName.PKNCAresults <- function(object) {
   "result"
 }
 
 #' @rdname is_sparse_pk
+#' @export
 is_sparse_pk.PKNCAresults <- function(object) {
   is_sparse_pk(object$data)
 }
diff --git a/man/group_vars.PKNCAconc.Rd b/man/group_vars.PKNCAconc.Rd
index 10161985..f19127af 100644
--- a/man/group_vars.PKNCAconc.Rd
+++ b/man/group_vars.PKNCAconc.Rd
@@ -5,9 +5,9 @@
 \alias{group_vars.PKNCAdose}
 \title{Get grouping variables for a PKNCA object}
 \usage{
-\method{group_vars}{PKNCAconc}(x)
+group_vars.PKNCAconc(x)
 
-\method{group_vars}{PKNCAdose}(x)
+group_vars.PKNCAdose(x)
 }
 \arguments{
 \item{x}{The PKNCA object}
@@ -20,6 +20,6 @@ Get grouping variables for a PKNCA object
 }
 \section{Functions}{
 \itemize{
-\item \code{group_vars(PKNCAdose)}: Get group_vars for a PKNCAdose object
+\item \code{group_vars.PKNCAdose()}: Get group_vars for a PKNCAdose object
 
 }}