A column chart with it's NumericAxis' roundingMethod attribute set to null.

StackedColumnRoundingMethodNull.js

YUI().use('charts', function (Y) 
{ 
    var myDataValues = [ 
            {category:"5/1/2010", miscellaneous:2000, expenses:3700, revenue:2200}, 
            {category:"5/2/2010", miscellaneous:50, expenses:9100, revenue:100}, 
            {category:"5/3/2010", miscellaneous:400, expenses:1100, revenue:1500}, 
            {category:"5/4/2010", miscellaneous:200, expenses:1900, revenue:2800}, 
            {category:"5/5/2010", miscellaneous:5000, expenses:5000, revenue:2650}
        ],
        mychart = new Y.Chart({
            type:"column", 
            dataProvider:myDataValues, 
            stacked: true, 
            render:"#mychart",
            axes: {
                values: {
                    type: "numeric",
                    keys: ["miscellaneous", "expenses", "revenue"],
                    roundingMethod: null 
                }
            }
        });
 });