diff --git a/lib/contexsample_web/live/barchart.ex b/lib/contexsample_web/live/barchart.ex
index 3739dd0..d2ed41b 100644
--- a/lib/contexsample_web/live/barchart.ex
+++ b/lib/contexsample_web/live/barchart.ex
@@ -218,7 +218,11 @@ defmodule ContexSampleWeb.BarChartLive do
     data = 1..categories
     |> Enum.map(fn cat ->
       series_data = for _ <- 1..series do
-        random_within_range(10.0, 100.0)
+        if options.type == :stacked_absolute do
+          random_within_range(-10.0, 100.0)
+        else
+          random_within_range(10.0, 100.0)
+        end
       end
       ["Category #{cat}" | series_data]
     end)
diff --git a/lib/contexsample_web/live/shared.ex b/lib/contexsample_web/live/shared.ex
index 648e1e9..e53380e 100644
--- a/lib/contexsample_web/live/shared.ex
+++ b/lib/contexsample_web/live/shared.ex
@@ -32,7 +32,7 @@ defmodule ContexSampleWeb.Shared do
   def colour_options(), do: simple_option_list(~w(default themed custom warm pastel nil))
   def yes_no_options(), do: simple_option_list(~w(yes no))
   def legend_options(), do: simple_option_list(~w(legend_none legend_right legend_top legend_bottom))
-  def chart_type_options(), do: simple_option_list(~w(stacked grouped))
+  def chart_type_options(), do: simple_option_list(~w(stacked stacked_absolute grouped))
   def chart_orientation_options(), do: simple_option_list(~w(vertical horizontal))
 
 
@@ -89,6 +89,7 @@ defmodule ContexSampleWeb.Shared do
   defp update_type(options, raw) do
     case raw do
       "stacked" -> Map.put(options, :type, :stacked)
+      "stacked_absolute" -> Map.put(options, :type, :stacked_absolute)
       "grouped" -> Map.put(options, :type, :grouped)
       _-> Map.put(options, :type, raw)
     end