I have taken some code for a layered chart and adapting to my own. It is on a custom object called X3RE_Snapshot_Data__c. The controller seems to save fine, but the VF page gives me an error Unknown property 'threeREChartController.getData' Usually I can figure that out - but I am at a loss. I figure my controller is messed up somewhere. Below if the code for both.

public with sharing class threeREChartController{


    public threeREChartController (){}

    public List<SnapshotData> getData() {
        AggregateResult[] result = [SELECT id,SUM(X3RE__c) daily3RE, AVG(X3RE__c) dailyavg3RE,
                                    CALENDAR_MONTH(CreatedDate) month,
                                    CALENDAR_YEAR(CreatedDate) year
                                    FROM X3RE_Snapshot_Data__c GROUP BY ID,
                                    CALENDAR_YEAR(CreatedDate),CALENDAR_MONTH(CreatedDate)
                                    HAVING 
                                    CALENDAR_YEAR(CreatedDate) = 2013];
                                    

        List<SnapshotData> threeREData = new List<SnapshotData>();
        for (AggregateResult a : result)
        {
            Datetime d=Datetime.newInstance((Integer)a.get('year'),(Integer)a.get('month'), 1);
            SnapshotData snap = new SnapshotData(d.format('MMM'),
                                                      (Double)a.get('dailyavg3RE'),
                                                      (Double)a.get('daily3RE'));     

            threeREData.add(snap);
        }
        return threeREData;
    }

    public class SnapshotData
    {
        public String month { get; set; }
        public Double dailyavg3RE { get; set; }
        public Double daily3RE { get; set; }

        public SnapshotData(String mon, Double davg, Double daily)
        {
            month = mon;
            dailyavg3RE = davg;
            daily3RE = daily;
        }
    }
}

<apex:page controller="threeREChartController" showHeader="false" sidebar="false">
    <apex:sectionHeader title="3RE"/>
    <apex:chart height="380" width="700" data="{!getData}">
        <apex:legend position="right"/>
        <apex:axis type="Numeric" position="left" fields="dailyavg3RE"
            title="Average"/>
        <apex:axis type="Category" position="bottom" fields="month"
            title="Month of the Year">
            <apex:chartLabel rotate="315"/>
        </apex:axis>
        <apex:barSeries title="3RE" orientation="vertical" axis="left"
            xField="daily" yField="daily3RE">
            <apex:chartTips height="20" width="120"/>
        </apex:barSeries>
        <apex:axis type="Numeric" position="right" fields="daily3RE"
            title="3RE" grid="true"/>
        <apex:lineSeries title="3RE" axis="right" xField="month" yField="daily3RE"
            fill="true" markerType="cross" markerSize="4" markerFill="#FF0000"/>
    </apex:chart>
</apex:page>

 One other quick question - can you add filters to the vf charts?