diff --git a/adhoc/adhoc_playground.html b/adhoc/adhoc_playground.html
new file mode 100644
index 0000000..7078bfb
--- /dev/null
+++ b/adhoc/adhoc_playground.html
@@ -0,0 +1,25 @@
+<div id="chartContainer">
+    <script src="/lib/d3.v3.4.8.min.js"></script>
+    <script src="/dist/dimple.v2.0.2.js"></script>
+    <script type="text/javascript">
+        var data = [
+            { xAxis: "59", yAxis: 10460, stack: "b" },
+            { xAxis: "1014", yAxis: 5400, stack: "a" },
+            { xAxis: "15.19", yAxis: 11809, stack: "a" },
+            { xAxis: "15.19", yAxis: 11809, stack: "b" },
+            { xAxis: "00002024", yAxis: 11048, stack: "a" },
+            { xAxis: "0.0", yAxis: 10599, stack: "a" },
+            { xAxis: "00002024", yAxis: 11048, stack: "b" },
+            { xAxis: "2.529", yAxis: 14248, stack: "b" },
+            { xAxis: "3034", yAxis: 10435, stack: "a" },
+            { xAxis: "353.9", yAxis: 9880, stack: "b" }
+        ];
+        var svg = dimple.newSvg("#chartContainer", 800, 600);
+        var chart = new dimple.chart(svg, data);
+        var x = chart.addCategoryAxis("x", "xAxis");
+        x.addOrderRule("xAxis");
+        var y = chart.addMeasureAxis("y", "yAxis");
+        var s = chart.addSeries("stack", dimple.plot.bar);
+        chart.draw();
+    </script>
+</div>
\ No newline at end of file
diff --git a/dist/dimple.v2.0.2.js b/dist/dimple.v2.0.2.js
index e0957d7..1995536 100644
--- a/dist/dimple.v2.0.2.js
+++ b/dist/dimple.v2.0.2.js
@@ -3991,7 +3991,7 @@
                             i;
                         for (i = 0; i < array.length; i += 1) {
                             if (isNaN(array[i])) {
-                                total = 0;
+                                total = undefined;
                                 break;
                             } else {
                                 total += parseFloat(array[i]);
@@ -4003,7 +4003,7 @@
                         var result = 0,
                             sumA = sum(a),
                             sumB = sum(b);
-                        if (!isNaN(sumA) && sumA !== 0 && !isNaN(sumB) && sumB !== 0) {
+                        if (!isNaN(sumA) && !isNaN(sumB)) {
                             result = parseFloat(sumA) - parseFloat(sumB);
                         } else if (!isNaN(Date.parse(a[0])) && !isNaN(Date.parse(b[0]))) {
                             result = Date.parse(a[0]) - Date.parse(b[0]);
diff --git a/dist/dimple.v2.0.2.min.js b/dist/dimple.v2.0.2.min.js
index ba99e34..5f13af7 100644
--- a/dist/dimple.v2.0.2.min.js
+++ b/dist/dimple.v2.0.2.min.js
@@ -1,3 +1,3 @@
 !function(a,b){"use strict";if("object"==typeof exports)module.exports=b(require("d3"));else if("function"==typeof define&&define.amd)define(["d3"],function(c){return a.dimple=b(c),a.dimple});else if(a.d3)a.dimple=b(a.d3);else{if(!console||!console.warn)throw"dimple requires d3 to run.  Are you missing a reference to the d3 library?";console.warn("dimple requires d3 to run.  Are you missing a reference to the d3 library?")}}(this,function(a){"use strict";var b={version:"2.0.1",plot:{},aggregateMethod:{}};return b.axis=function(c,d,e,f,g){this.chart=c,this.position=d,this.categoryFields=null===g||void 0===g?e:[].concat(g),this.measure=f,this.timeField=g,this.floatingBarWidth=5,this.hidden=!1,this.showPercent=!1,this.colors=null,this.overrideMin=null,this.overrideMax=null,this.shapes=null,this.showGridlines=null,this.gridlineShapes=null,this.titleShape=null,this.dateParseFormat=null,this.tickFormat=null,this.timePeriod=null,this.timeInterval=1,this.useLog=!1,this.logBase=10,this.title=void 0,this.clamp=!0,this.ticks=null,this.fontSize="10px",this.fontFamily="sans-serif",this._slaves=[],this._scale=null,this._min=0,this._max=0,this._previousOrigin=null,this._origin=null,this._orderRules=[],this._groupOrderRules=[],this._draw=null,this._getAxisData=function(){var a,b,c=[],d=!1;if(this.chart&&this.chart.series){for(a=0;a<this.chart.series.length;a+=1)b=this.chart.series[a],b[this.position]===this&&(b.data&&b.data.length>0?c=c.concat(b.data):d=!0);d&&this.chart.data&&(c=c.concat(this.chart.data))}return c},this._getFontSize=function(){var a;return a=this.fontSize&&"auto"!==this.fontSize.toString().toLowerCase()?isNaN(this.fontSize)?this.fontSize:this.fontSize+"px":(this.chart._heightPixels()/35>10?this.chart._heightPixels()/35:10)+"px"},this._getFormat=function(){var b,c,d,e,f,g,h;return null!==this.tickFormat&&void 0!==this.tickFormat?b=this._hasTimeField()?a.time.format(this.tickFormat):a.format(this.tickFormat):this.showPercent?b=a.format("%"):this.useLog&&null!==this.measure?b=function(b){var c=Math.floor(Math.abs(b),0).toString().length,d=Math.min(Math.floor((c-1)/3),4),e="kmBT".substring(d-1,d),f="0"===Math.round(10*(b/Math.pow(1e3,d))).toString().slice(-1)?0:1;return 0===b?0:a.format(",."+f+"f")(b/Math.pow(1e3,d))+e}:null!==this.measure?(c=Math.floor(Math.abs(this._max),0).toString(),d=Math.floor(Math.abs(this._min),0).toString(),e=Math.max(d.length,c.length),e>3?(f=Math.min(Math.floor((e-1)/3),4),g="kmBT".substring(f-1,f),h=1>=e-3*f?1:0,b=function(b){return 0===b?0:a.format(",."+h+"f")(b/Math.pow(1e3,f))+g}):(h=1>=e?1:0,b=a.format(",."+h+"f"))):b=function(a){return a},b},this._getTimePeriod=function(){var b=this.timePeriod,c=30,d=this._max-this._min;return this._hasTimeField()&&!this.timePeriod&&(b=c>=d/1e3?a.time.seconds:c>=d/6e4?a.time.minutes:c>=d/36e5?a.time.hours:c>=d/864e5?a.time.days:c>=d/6048e5?a.time.weeks:c>=d/26298e5?a.time.months:a.time.years),b},this._getTooltipText=function(a,b){if(this._hasTimeField())b[this.position+"Field"][0]&&a.push(this.timeField+": "+this._getFormat()(b[this.position+"Field"][0]));else if(this._hasCategories())this.categoryFields.forEach(function(c,d){null!==c&&void 0!==c&&b[this.position+"Field"][d]&&a.push(c+(b[this.position+"Field"][d]!==c?": "+b[this.position+"Field"][d]:""))},this);else if(this._hasMeasure())switch(this.position){case"x":a.push(this.measure+": "+this._getFormat()(b.width));break;case"y":a.push(this.measure+": "+this._getFormat()(b.height));break;case"z":a.push(this.measure+": "+this._getFormat()(b.zValue));break;case"c":a.push(this.measure+": "+this._getFormat()(b.cValue))}},this._getTopMaster=function(){var a=this;return null!==this.master&&void 0!==this.master&&(a=this.master._getTopMaster()),a},this._hasCategories=function(){return null!==this.categoryFields&&void 0!==this.categoryFields&&this.categoryFields.length>0},this._hasMeasure=function(){return null!==this.measure&&void 0!==this.measure},this._hasTimeField=function(){return null!==this.timeField&&void 0!==this.timeField},this._parseDate=function(b){var c;return c=null===this.dateParseFormat||void 0===this.dateParseFormat?isNaN(b)?Date.parse(b):new 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 }).style("font-family",e.tooltipFontFamily).style("font-size",e._getTooltipFontSize()),f.each(function(){z=this.getBBox().width>z?this.getBBox().width:z,A=this.getBBox().width>A?this.getBBox().height:A}),f.selectAll("text").attr("x",0).attr("y",function(){return y+=this.getBBox().height,y-this.getBBox().height/2}),g.attr("x",-k).attr("y",-k).attr("height",Math.floor(y+k)-.5).attr("width",z+2*k).attr("rx",5).attr("ry",5).style("fill",w).style("stroke",v).style("stroke-width",2).style("opacity",.95),o+q+k+l+z<parseFloat(d.svg.node().getBBox().width)?(h=o+q+k+l,i=p+r/2-(y-(A-k))/2):o-(k+l+z)>0?(h=o-(k+l+z),i=p+r/2-(y-(A-k))/2):p+r+y+l+k<parseFloat(d.svg.node().getBBox().height)?(h=o+q/2-(2*k+z)/2,h=h>0?h:l,h=h+z<parseFloat(d.svg.node().getBBox().width)?h:parseFloat(d.svg.node().getBBox().width)-z-l,i=p+r+2*k):(h=o+q/2-(2*k+z)/2,h=h>0?h:l,h=h+z<parseFloat(d.svg.node().getBBox().width)?h:parseFloat(d.svg.node().getBBox().width)-z-l,i=p-y-(A-k)),f.attr("transform","translate("+h+" , "+i+")")},b._showPointTooltip=function(c,d,e,f){var g,h,i,j,k=5,l=10,m=750,n=a.select(d),o=parseFloat(n.attr("cx")),p=parseFloat(n.attr("cy")),q=parseFloat(n.attr("r")),r=b._helpers.opacity(c,e,f),s=n.attr("stroke"),t=f._dropLineOrigin(),u=a.rgb(a.rgb(s).r+.6*(255-a.rgb(s).r),a.rgb(s).g+.6*(255-a.rgb(s).g),a.rgb(s).b+.6*(255-a.rgb(s).b)),v=a.rgb(a.rgb(s).r+.8*(255-a.rgb(s).r),a.rgb(s).g+.8*(255-a.rgb(s).g),a.rgb(s).b+.8*(255-a.rgb(s).b)),w=0,x=0,y=0,z=f.getTooltipText(c);null!==e._tooltipGroup&&void 0!==e._tooltipGroup&&e._tooltipGroup.remove(),e._tooltipGroup=e.svg.append("g"),e._tooltipGroup.append("circle").attr("cx",o).attr("cy",p).attr("r",q).attr("opacity",0).style("fill","none").style("stroke",s).style("stroke-width",1).transition().duration(m/2).ease("linear").attr("opacity",1).attr("r",q+f.lineWeight+2).style("stroke-width",2),null!==t.y&&e._tooltipGroup.append("line").attr("x1",o).attr("y1",p<t.y?p+q+f.lineWeight+2:p-q-f.lineWeight-2).attr("x2",o).attr("y2",p<t.y?p+q+f.lineWeight+2:p-q-f.lineWeight-2).style("fill","none").style("stroke",s).style("stroke-width",2).style("stroke-dasharray","3, 3").style("opacity",r).transition().delay(m/2).duration(m/2).ease("linear").attr("y2",p<t.y?t.y-1:t.y+1),null!==t.x&&e._tooltipGroup.append("line").attr("x1",o<t.x?o+q+f.lineWeight+2:o-q-f.lineWeight-2).attr("y1",p).attr("x2",o<t.x?o+q+f.lineWeight+2:o-q-f.lineWeight-2).attr("y2",p).style("fill","none").style("stroke",s).style("stroke-width",2).style("stroke-dasharray","3, 3").style("opacity",r).transition().delay(m/2).duration(m/2).ease("linear").attr("x2",o<t.x?t.x-1:t.x+1),g=e._tooltipGroup.append("g"),h=g.append("rect").attr("class","dimple-tooltip"),g.selectAll(".dont-select-any").data(z).enter().append("text").attr("class","dimple-tooltip").text(function(a){return a}).style("font-family",f.tooltipFontFamily).style("font-size",f._getTooltipFontSize()),g.each(function(){x=this.getBBox().width>x?this.getBBox().width:x,y=this.getBBox().width>y?this.getBBox().height:y}),g.selectAll("text").attr("x",0).attr("y",function(){return w+=this.getBBox().height,w-this.getBBox().height/2}),h.attr("x",-k).attr("y",-k).attr("height",Math.floor(w+k)-.5).attr("width",x+2*k).attr("rx",5).attr("ry",5).style("fill",v).style("stroke",u).style("stroke-width",2).style("opacity",.95),o+q+k+l+x<parseFloat(e.svg.node().getBBox().width)?(i=o+q+k+l,j=p-(w-(y-k))/2):o-q-(k+l+x)>0?(i=o-q-(k+l+x),j=p-(w-(y-k))/2):p+q+w+l+k<parseFloat(e.svg.node().getBBox().height)?(i=o-(2*k+x)/2,i=i>0?i:l,i=i+x<parseFloat(e.svg.node().getBBox().width)?i:parseFloat(e.svg.node().getBBox().width)-x-l,j=p+q+2*k):(i=o-(2*k+x)/2,i=i>0?i:l,i=i+x<parseFloat(e.svg.node().getBBox().width)?i:parseFloat(e.svg.node().getBBox().width)-x-l,j=p-w-(y-k)),g.attr("transform","translate("+i+" , "+j+")")},b.filterData=function(a,b,c){var d=a;return null!==b&&null!==c&&(null!==c&&void 0!==c&&(c=[].concat(c)),d=[],a.forEach(function(a){null===a[b]?d.push(a):c.indexOf([].concat(a[b]).join("/"))>-1&&d.push(a)},this)),d},b.getUniqueValues=function(a,b){var c=[];return null!==b&&void 0!==b&&(b=[].concat(b),a.forEach(function(a){var d="";b.forEach(function(b,c){c>0&&(d+="/"),d+=a[b]},this),-1===c.indexOf(d)&&c.push(d)},this)),c},b.newSvg=function(b,c,d){var e=null;if((null===b||void 0===b)&&(b="body"),e=a.select(b),e.empty())throw"The '"+b+"' selector did not match any elements.  Please prefix with '#' to select by id or '.' to select by class";return e.append("svg").attr("width",c).attr("height",d)},b});
\ No newline at end of file
diff --git a/src/methods/_getOrderedList.js b/src/methods/_getOrderedList.js
index 2de505b..8411d1d 100644
--- a/src/methods/_getOrderedList.js
+++ b/src/methods/_getOrderedList.js
@@ -60,7 +60,7 @@
                             i;
                         for (i = 0; i < array.length; i += 1) {
                             if (isNaN(array[i])) {
-                                total = 0;
+                                total = undefined;
                                 break;
                             } else {
                                 total += parseFloat(array[i]);
@@ -72,7 +72,7 @@
                         var result = 0,
                             sumA = sum(a),
                             sumB = sum(b);
-                        if (!isNaN(sumA) && sumA !== 0 && !isNaN(sumB) && sumB !== 0) {
+                        if (!isNaN(sumA) && !isNaN(sumB)) {
                             result = parseFloat(sumA) - parseFloat(sumB);
                         } else if (!isNaN(Date.parse(a[0])) && !isNaN(Date.parse(b[0]))) {
                             result = Date.parse(a[0]) - Date.parse(b[0]);
diff --git a/test/methods/_getOrderList.spec.js b/test/methods/_getOrderList.spec.js
index 368da61..f99363a 100644
--- a/test/methods/_getOrderList.spec.js
+++ b/test/methods/_getOrderList.spec.js
@@ -12,7 +12,7 @@ define(["dimple"], function (dimple) {
                 { "Int": 1, "Float": 234, "Text": "XFBGR", "Date": "12/5/99", "Group": "A"},
                 { "Int": 2, "Float": 54.35, "Text": "YTREB", "Date": "1/1/00", "Group": "A"},
                 { "Int": 3, "Float": -453, "Text": "XGFDY", "Date": "2 February 2007", "Group": "B"},
-                { "Int": 4, "Float": 5436546, "Text": "XGFDE", "Date": "2000-03-01", "Group": "B"},
+                { "Int": 0, "Float": 5436546, "Text": "XGFDE", "Date": "2000-03-01", "Group": "B"},
                 { "Int": 5, "Float": 4323, "Text": "YTREB", "Date": "10/10/2000", "Group": "C"},
                 { "Int": 6, "Float": 0, "Text": "GFDHN", "Date": "11/10/2000", "Group": "C"},
                 { "Int": 7, "Float": -453, "Text": "TRET", "Date": "10/9/2000", "Group": "D"},
@@ -31,7 +31,7 @@ define(["dimple"], function (dimple) {
 
         it("Implicitly orders by a single dimension", function () {
             expect(getResults(data, "Int"))
-                .toEqual("1, 2, 3, 4, 5, 6, 7");
+                .toEqual("0, 1, 2, 3, 5, 6, 7");
             expect(getResults(data, "Float"))
                 .toEqual("-453, 0, 54.35, 234, 4323, 5436546");
             expect(getResults(data, "Text"))
@@ -42,7 +42,7 @@ define(["dimple"], function (dimple) {
 
         it("Explicitly orders by a single dimension", function () {
             expect(getResults(data, "Int", { ordering : "Int" }))
-                .toEqual("1, 2, 3, 4, 5, 6, 7");
+                .toEqual("0, 1, 2, 3, 5, 6, 7");
             expect(getResults(data, "Float", { ordering : "Float" }))
                 .toEqual("-453, 0, 54.35, 234, 4323, 5436546");
             expect(getResults(data, "Text", { ordering : "Text" }))
@@ -53,7 +53,7 @@ define(["dimple"], function (dimple) {
 
         it("Orders descending by a single dimension", function () {
             expect(getResults(data, "Int", { ordering : "Int", desc : true }))
-                .toEqual("7, 6, 5, 4, 3, 2, 1");
+                .toEqual("7, 6, 5, 3, 2, 1, 0");
             expect(getResults(data, "Float", { ordering : "Float", desc : true }))
                 .toEqual("5436546, 4323, 234, 54.35, 0, -453");
             expect(getResults(data, "Text", { ordering : "Text", desc : true }))
@@ -63,22 +63,22 @@ define(["dimple"], function (dimple) {
         });
 
         it("Orders by a passed array", function () {
-            expect(getResults(data, "Int", { ordering : [3, 7, 4, 5, 2, 1, 6] }))
-                .toEqual("3, 7, 4, 5, 2, 1, 6");
-            expect(getResults(data, "Int", { ordering : [3, 7, 4, 5, 2, 1, 6], desc : true }))
-                .toEqual("6, 1, 2, 5, 4, 7, 3");
-            expect(getResults(data, "Int", { ordering : [3, 7, 4] }))
-                .toEqual("3, 7, 4, 1, 2, 5, 6");
-            expect(getResults(data, "Int", { ordering : [3, 7, 4], desc : true }))
-                .toEqual("4, 7, 3, 1, 2, 5, 6");
-            expect(getResults(data, "Int", { ordering : ["3", "7", "4", "5", "2", "1", "6"] }))
-                .toEqual("3, 7, 4, 5, 2, 1, 6");
-            expect(getResults(data, "Int", { ordering : ["3", "7", "4", "5", "2", "1", "6"], desc : true }))
-                .toEqual("6, 1, 2, 5, 4, 7, 3");
-            expect(getResults(data, "Int", { ordering : ["3", "7", "4"] }))
-                .toEqual("3, 7, 4, 1, 2, 5, 6");
-            expect(getResults(data, "Int", { ordering : ["3", "7", "4"], desc : true }))
-                .toEqual("4, 7, 3, 1, 2, 5, 6");
+            expect(getResults(data, "Int", { ordering : [3, 7, 0, 5, 2, 1, 6] }))
+                .toEqual("3, 7, 0, 5, 2, 1, 6");
+            expect(getResults(data, "Int", { ordering : [3, 7, 0, 5, 2, 1, 6], desc : true }))
+                .toEqual("6, 1, 2, 5, 0, 7, 3");
+            expect(getResults(data, "Int", { ordering : [3, 7, 0] }))
+                .toEqual("3, 7, 0, 1, 2, 5, 6");
+            expect(getResults(data, "Int", { ordering : [3, 7, 0], desc : true }))
+                .toEqual("0, 7, 3, 1, 2, 5, 6");
+            expect(getResults(data, "Int", { ordering : ["3", "7", "0", "5", "2", "1", "6"] }))
+                .toEqual("3, 7, 0, 5, 2, 1, 6");
+            expect(getResults(data, "Int", { ordering : ["3", "7", "0", "5", "2", "1", "6"], desc : true }))
+                .toEqual("6, 1, 2, 5, 0, 7, 3");
+            expect(getResults(data, "Int", { ordering : ["3", "7", "0"] }))
+                .toEqual("3, 7, 0, 1, 2, 5, 6");
+            expect(getResults(data, "Int", { ordering : ["3", "7", "0"], desc : true }))
+                .toEqual("0, 7, 3, 1, 2, 5, 6");
         });
 
         it("Orders by a custom function", function () {
@@ -90,9 +90,9 @@ define(["dimple"], function (dimple) {
 
         it("Orders by a second category", function () {
             expect(getResults(data, "Int", { ordering : "Text" }))
-                .toEqual("6, 7, 1, 4, 3, 2, 5");
+                .toEqual("6, 7, 1, 0, 3, 2, 5");
             expect(getResults(data, "Int", { ordering : "Text", desc : true }))
-                .toEqual("2, 5, 3, 4, 1, 7, 6");
+                .toEqual("2, 5, 3, 0, 1, 7, 6");
             expect(getResults(data, "Group", { ordering : "Float" }))
                 .toEqual("D, A, C, B, E");
             expect(getResults(data, "Group", { ordering : "Float", desc : true }))
@@ -101,13 +101,13 @@ define(["dimple"], function (dimple) {
 
         it("Orders by a third category", function () {
             expect(getResults(data, "Int", [{ ordering : "Group" }, { ordering : "Float" }]))
-                .toEqual("2, 1, 3, 4, 6, 5, 7");
+                .toEqual("2, 1, 3, 0, 6, 5, 7");
             expect(getResults(data, "Int", [{ ordering : "Group", desc : true}, { ordering : "Float" }]))
-                .toEqual("7, 6, 5, 3, 4, 2, 1");
+                .toEqual("7, 6, 5, 3, 0, 2, 1");
             expect(getResults(data, "Int", [{ ordering : "Group"}, { ordering : "Float", desc : true }]))
-                .toEqual("1, 2, 4, 3, 5, 6, 7");
+                .toEqual("1, 2, 0, 3, 5, 6, 7");
             expect(getResults(data, "Int", [{ ordering : "Group", desc : true}, { ordering : "Float", desc : true }]))
-                .toEqual("7, 5, 6, 4, 3, 1, 2");
+                .toEqual("7, 5, 6, 0, 3, 1, 2");
         });
     });
 });
\ No newline at end of file