rCharts dimplejs rendition of bfast on S&P 500

Readme.md

rCharts + dimplejs Visualization of bfast on S&P 500

Analyze breakpoints with the R package bfast with an interactive d3.js visualization using rCharts and the dimplejs library.

R bfast code from blog post

For a better understanding of bfast please see the following paper.

Verbesselt J, Hyndman R, Newnham G, Culvenor D (2010) Detecting Trend and Seasonal Changes in Satellite Image Time Series. Remote Sensing of Environment, 114(1), 106–115. http://dx.doi.org/10.1016/j.rse.2009.08.014

S&P 500 data from Yahoo! Finance - used for personal education purposes

code.R

#sample bfast code from blog post
#http://timelyportfolio.blogspot.com/2012/04/structural-breaks-bull-or-bear.html
#analyze breakpoints with the R package bfast
#please read the paper 
#Verbesselt J, Hyndman R, Newnham G, Culvenor D (2010)
#Detecting Trend and Seasonal Changes in Satellite Image Time Series.
#Remote Sensing of Environment, 114(1), 106–115.
#http://dx.doi.org/10.1016/j.rse.2009.08.014

require(bfast)
require(quantmod)

getSymbols("^GSPC",from="1950-01-01")
#convert to log price
GSPC.monthly <- log(to.monthly(GSPC)[,4])
#get monthly returns for the close price
#not necessary, leave in price form
#GSPC.return <- monthlyReturn(GSPC[,4])
#need ts representation so do some brute force conversion
GSPC.ts <- ts(as.vector(GSPC.monthly["1951-01::"]),start=c(1951,1),frequency=12)
#look at the stl Seasonal-Trend decomposition procedure already in R
GSPC.stl <- stl(GSPC.ts,s.window="periodic")
plot(GSPC.stl,main="STL Decomposition of S&P 500")


#get the results from bfast
#adjusting h lower will result in more breakpoints
GSPC.bfast <- bfast(GSPC.ts,h=0.2,max.iter=1,season="none")

plot(GSPC.bfast,type="components",ylim=c(3,max(GSPC.monthly)+1),main="S&P 500 with bfast Breakpoints and Components")
plot(GSPC.bfast,type="trend",ylim=c(3,max(GSPC.monthly)+1),main="S&P 500 with bfast Trend Breakpoints")


#see everything with type="all" but in bfast calculation set seasonal to "none"
#play away with this
#plot(GSPC.bfast,type="all")

#do some additional plotting
#[[1]] is used since for speed I only did one iteration
#could plot each iteration if I did multiple
plot(GSPC.bfast$Yt/GSPC.bfast$output[[1]]$Tt-1,
     main="bfast Remainder as % of S&P 500 Price",
     xlab=NA, ylab="remainder (% of price)",bty="l")
#add vertical line for the breakpoints
abline(v=breakdates(GSPC.bfast$output[[1]]$bp.Vt),col="gray70")
#add horizontal line at 0
abline(h=0,col="black",lty=2)
text(x=breakdates(GSPC.bfast$output[[1]]$bp.Vt),y=par("usr")[3]+.01,
     labels=breakdates(GSPC.bfast$output[[1]]$bp.Vt,format.times=TRUE),
     srt=90,pos=4,cex=0.75)



require(rCharts)
options(viewer=NULL)

bfast.df <- data.frame(
  date = format(index(as.xts(GSPC.bfast$output[[1]]$Tt)),"%Y-%m-%d")#as.Date(index(as.xts(GSPC.bfast$output[[1]]$Tt)))
  ,bfast = as.numeric(GSPC.bfast$output[[1]]$Tt)
)
#just use dimple to start
dBfast <- dPlot(
  price ~ date,
  data = data.frame(
    date = format(as.Date(index(GSPC.monthly)),"%Y-%m-%d"),#as.numeric(as.Date(index(GSPC.monthly)))
    price = as.numeric(GSPC.monthly)
  ),
  type = "line"
)
#set up a time based x axis
dBfast$xAxis(
  #type = "addCategoryAxis",
  type = "addTimeAxis"
  ,inputFormat = "%Y-%m-%d"
  ,outputFormat = "%Y"
)
dBfast$yAxis(
  overrideMin = 0,
  overrideMax = 8
)
dBfast
#add the bfast layer
#with new dataset for layer
dBfast$templates$script = "../rCharts/inst/libraries/dimple/layouts/chart.html"
dBfast$layer(
  x = "date",
  y = "bfast",
  data = bfast.df,
  type = "line"
)
dBfast

# various cleanup experiments
# what should be in dimple/rCharts by default
# or made easier
dBfast$setTemplate(
  afterScript = '
    <script>
      myChart.series[2].shapes
        .transition().duration(10).delay(1000)
          .style("stroke","#AD5277")
          .style("stroke-dasharray",[10,5])
      //delete some of the ticks
      myChart.svg.select(".axis").selectAll(".tick")[0].forEach(function(d,i){
          if (!(+d3.time.format("%Y")(new Date(+d3.select(d).datum())) % 10 == 0)) {
            d.remove()
          }
        })
      myChart.svg.select(".axis").selectAll(".tick text")
        .attr("transform","none")
        .style("text-anchor","middle");
    </script>
  '
)
dBfast

index.html

<!doctype HTML>
<meta charset = 'utf-8'>
<html>
  <head>
    
    <script src='http://d3js.org/d3.v3.min.js' type='text/javascript'></script>
    <script src='http://dimplejs.org/dist/dimple.v1.1.5.min.js' type='text/javascript'></script>
    
    <style>
    .rChart {
      display: block;
      margin-left: auto; 
      margin-right: auto;
      width: 800px;
      height: 400px;
    }  
    .tooltip {
      opacity:1;
    }
    </style>
    
  </head>
  <body >
    
    <div id = 'chart35607324f46' class = 'rChart dimple'></div>    
    <script type="text/javascript">
  var opts = {
 "dom": "chart35607324f46",
"width":    800,
"height":    400,
"xAxis": {
 "type": "addTimeAxis",
"showPercent": false,
"inputFormat": "%Y-%m-%d",
"outputFormat": "%Y" 
},
"yAxis": {
 "type": "addMeasureAxis",
"showPercent": false,
"overrideMin":      0,
"overrideMax":      8 
},
"zAxis": [],
"colorAxis": [],
"defaultColors": [],
"layers": [
 {
 "x": "date",
"y": "bfast",
"data": {
 "date": [ "1951-01-01", "1951-02-01", "1951-03-01", "1951-04-01", "1951-05-01", "1951-06-01", "1951-07-01", "1951-08-01", "1951-09-01", "1951-10-01", "1951-11-01", "1951-12-01", "1952-01-01", "1952-02-01", "1952-03-01", "1952-04-01", "1952-05-01", "1952-06-01", "1952-07-01", "1952-08-01", "1952-09-01", "1952-10-01", "1952-11-01", "1952-12-01", "1953-01-01", "1953-02-01", "1953-03-01", "1953-04-01", "1953-05-01", "1953-06-01", "1953-07-01", "1953-08-01", "1953-09-01", "1953-10-01", "1953-11-01", "1953-12-01", "1954-01-01", "1954-02-01", "1954-03-01", "1954-04-01", "1954-05-01", "1954-06-01", "1954-07-01", "1954-08-01", "1954-09-01", "1954-10-01", "1954-11-01", "1954-12-01", "1955-01-01", "1955-02-01", "1955-03-01", "1955-04-01", "1955-05-01", "1955-06-01", "1955-07-01", "1955-08-01", "1955-09-01", "1955-10-01", "1955-11-01", "1955-12-01", "1956-01-01", "1956-02-01", "1956-03-01", "1956-04-01", "1956-05-01", "1956-06-01", "1956-07-01", "1956-08-01", "1956-09-01", "1956-10-01", "1956-11-01", "1956-12-01", "1957-01-01", "1957-02-01", "1957-03-01", "1957-04-01", "1957-05-01", "1957-06-01", "1957-07-01", "1957-08-01", "1957-09-01", "1957-10-01", "1957-11-01", "1957-12-01", "1958-01-01", "1958-02-01", "1958-03-01", "1958-04-01", "1958-05-01", "1958-06-01", "1958-07-01", "1958-08-01", "1958-09-01", "1958-10-01", "1958-11-01", "1958-12-01", "1959-01-01", "1959-02-01", "1959-03-01", "1959-04-01", "1959-05-01", "1959-06-01", "1959-07-01", "1959-08-01", "1959-09-01", "1959-10-01", "1959-11-01", "1959-12-01", "1960-01-01", "1960-02-01", "1960-03-01", "1960-04-01", "1960-05-01", "1960-06-01", "1960-07-01", "1960-08-01", "1960-09-01", "1960-10-01", "1960-11-01", "1960-12-01", "1961-01-01", "1961-02-01", "1961-03-01", "1961-04-01", "1961-05-01", "1961-06-01", "1961-07-01", "1961-08-01", "1961-09-01", "1961-10-01", "1961-11-01", "1961-12-01", "1962-01-01", "1962-02-01", "1962-03-01", "1962-04-01", "1962-05-01", "1962-06-01", "1962-07-01", "1962-08-01", "1962-09-01", "1962-10-01", "1962-11-01", "1962-12-01", "1963-01-01", "1963-02-01", "1963-03-01", "1963-04-01", "1963-05-01", "1963-06-01", "1963-07-01", "1963-08-01", "1963-09-01", "1963-10-01", "1963-11-01", "1963-12-01", "1964-01-01", "1964-02-01", "1964-03-01", "1964-04-01", "1964-05-01", "1964-06-01", "1964-07-01", "1964-08-01", "1964-09-01", "1964-10-01", "1964-11-01", "1964-12-01", "1965-01-01", "1965-02-01", "1965-03-01", "1965-04-01", "1965-05-01", "1965-06-01", "1965-07-01", "1965-08-01", "1965-09-01", "1965-10-01", "1965-11-01", "1965-12-01", "1966-01-01", "1966-02-01", "1966-03-01", "1966-04-01", "1966-05-01", "1966-06-01", "1966-07-01", "1966-08-01", "1966-09-01", "1966-10-01", "1966-11-01", "1966-12-01", "1967-01-01", "1967-02-01", "1967-03-01", "1967-04-01", "1967-05-01", "1967-06-01", "1967-07-01", "1967-08-01", "1967-09-01", "1967-10-01", "1967-11-01", "1967-12-01", "1968-01-01", "1968-02-01", "1968-03-01", "1968-04-01", "1968-05-01", "1968-06-01", "1968-07-01", "1968-08-01", "1968-09-01", "1968-10-01", "1968-11-01", "1968-12-01", "1969-01-01", "1969-02-01", "1969-03-01", "1969-04-01", "1969-05-01", "1969-06-01", "1969-07-01", "1969-08-01", "1969-09-01", "1969-10-01", "1969-11-01", "1969-12-01", "1970-01-01", "1970-02-01", "1970-03-01", "1970-04-01", "1970-05-01", "1970-06-01", "1970-07-01", "1970-08-01", "1970-09-01", "1970-10-01", "1970-11-01", "1970-12-01", "1971-01-01", "1971-02-01", "1971-03-01", "1971-04-01", "1971-05-01", "1971-06-01", "1971-07-01", "1971-08-01", "1971-09-01", "1971-10-01", "1971-11-01", "1971-12-01", "1972-01-01", "1972-02-01", "1972-03-01", "1972-04-01", "1972-05-01", "1972-06-01", "1972-07-01", "1972-08-01", "1972-09-01", "1972-10-01", "1972-11-01", "1972-12-01", "1973-01-01", "1973-02-01", "1973-03-01", "1973-04-01", "1973-05-01", "1973-06-01", "1973-07-01", "1973-08-01", "1973-09-01", "1973-10-01", "1973-11-01", "1973-12-01", "1974-01-01", "1974-02-01", "1974-03-01", "1974-04-01", "1974-05-01", "1974-06-01", "1974-07-01", 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"1992-05-01", "1992-06-01", "1992-07-01", "1992-08-01", "1992-09-01", "1992-10-01", "1992-11-01", "1992-12-01", "1993-01-01", "1993-02-01", "1993-03-01", "1993-04-01", "1993-05-01", "1993-06-01", "1993-07-01", "1993-08-01", "1993-09-01", "1993-10-01", "1993-11-01", "1993-12-01", "1994-01-01", "1994-02-01", "1994-03-01", "1994-04-01", "1994-05-01", "1994-06-01", "1994-07-01", "1994-08-01", "1994-09-01", "1994-10-01", "1994-11-01", "1994-12-01", "1995-01-01", "1995-02-01", "1995-03-01", "1995-04-01", "1995-05-01", "1995-06-01", "1995-07-01", "1995-08-01", "1995-09-01", "1995-10-01", "1995-11-01", "1995-12-01", "1996-01-01", "1996-02-01", "1996-03-01", "1996-04-01", "1996-05-01", "1996-06-01", "1996-07-01", "1996-08-01", "1996-09-01", "1996-10-01", "1996-11-01", "1996-12-01", "1997-01-01", "1997-02-01", "1997-03-01", "1997-04-01", "1997-05-01", "1997-06-01", "1997-07-01", "1997-08-01", "1997-09-01", "1997-10-01", "1997-11-01", "1997-12-01", "1998-01-01", "1998-02-01", "1998-03-01", "1998-04-01", "1998-05-01", "1998-06-01", "1998-07-01", "1998-08-01", "1998-09-01", "1998-10-01", "1998-11-01", "1998-12-01", "1999-01-01", "1999-02-01", "1999-03-01", "1999-04-01", "1999-05-01", "1999-06-01", "1999-07-01", "1999-08-01", "1999-09-01", "1999-10-01", "1999-11-01", "1999-12-01", "2000-01-01", "2000-02-01", "2000-03-01", "2000-04-01", "2000-05-01", "2000-06-01", "2000-07-01", "2000-08-01", "2000-09-01", "2000-10-01", "2000-11-01", "2000-12-01", "2001-01-01", "2001-02-01", "2001-03-01", "2001-04-01", "2001-05-01", "2001-06-01", "2001-07-01", "2001-08-01", "2001-09-01", "2001-10-01", "2001-11-01", "2001-12-01", "2002-01-01", "2002-02-01", "2002-03-01", "2002-04-01", "2002-05-01", "2002-06-01", "2002-07-01", "2002-08-01", "2002-09-01", "2002-10-01", "2002-11-01", "2002-12-01", "2003-01-01", "2003-02-01", "2003-03-01", "2003-04-01", "2003-05-01", "2003-06-01", "2003-07-01", "2003-08-01", "2003-09-01", "2003-10-01", "2003-11-01", "2003-12-01", "2004-01-01", "2004-02-01", "2004-03-01", "2004-04-01", "2004-05-01", "2004-06-01", "2004-07-01", "2004-08-01", "2004-09-01", "2004-10-01", "2004-11-01", "2004-12-01", "2005-01-01", "2005-02-01", "2005-03-01", "2005-04-01", "2005-05-01", "2005-06-01", "2005-07-01", "2005-08-01", "2005-09-01", "2005-10-01", "2005-11-01", "2005-12-01", "2006-01-01", "2006-02-01", "2006-03-01", "2006-04-01", "2006-05-01", "2006-06-01", "2006-07-01", "2006-08-01", "2006-09-01", "2006-10-01", "2006-11-01", "2006-12-01", "2007-01-01", "2007-02-01", "2007-03-01", "2007-04-01", "2007-05-01", "2007-06-01", "2007-07-01", "2007-08-01", "2007-09-01", "2007-10-01", "2007-11-01", "2007-12-01", "2008-01-01", "2008-02-01", "2008-03-01", "2008-04-01", "2008-05-01", "2008-06-01", "2008-07-01", "2008-08-01", "2008-09-01", "2008-10-01", "2008-11-01", "2008-12-01", "2009-01-01", "2009-02-01", "2009-03-01", "2009-04-01", "2009-05-01", "2009-06-01", "2009-07-01", "2009-08-01", "2009-09-01", "2009-10-01", "2009-11-01", "2009-12-01", "2010-01-01", 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  var svg = dimple.newSvg("#" + opts.id, opts.width, opts.height);

  //data = dimple.filterData(data, "Owner", ["Aperture", "Black Mesa"])
  var myChart = new dimple.chart(svg, data);
  if (opts.bounds) {
    myChart.setBounds(opts.bounds.x, opts.bounds.y, opts.bounds.width, opts.bounds.height);//myChart.setBounds(80, 30, 480, 330);
  }
  //dimple allows use of custom CSS with noFormats
  if(opts.noFormats) { myChart.noFormats = opts.noFormats; };
  //for markimekko and addAxis also have third parameter measure
  //so need to evaluate if measure provided
  
  //function to build axes
  function buildAxis(position,layer){
    var axis;
    var axisopts = opts[position+"Axis"];
    
    if(axisopts.measure) {
      axis = myChart[axisopts.type](position,layer[position],axisopts.measure);
    } else {
      axis = myChart[axisopts.type](position, layer[position]);
    };
    if(!(axisopts.type === "addPctAxis")) axis.showPercent = axisopts.showPercent;
    if (axisopts.orderRule) axis.addOrderRule(axisopts.orderRule);
    if (axisopts.grouporderRule) axis.addGroupOrderRule(axisopts.grouporderRule);  
    if (axisopts.overrideMin) axis.overrideMin = axisopts.overrideMin;
    if (axisopts.overrideMax) axis.overrideMax = axisopts.overrideMax;
    if (axisopts.overrideMax) axis.overrideMax = axisopts.overrideMax;
    if (axisopts.inputFormat) axis.dateParseFormat = axisopts.inputFormat;
    if (axisopts.outputFormat) axis.tickFormat = axisopts.outputFormat;    
    return axis;
  };
  
  var c = null;
  if(d3.keys(opts.colorAxis).length > 0) {
    c = myChart[opts.colorAxis.type](opts.colorAxis.colorSeries,opts.colorAxis.palette) ;
  }
  
  //allow manipulation of default colors to use with dimple
  if(opts.defaultColors.length) {
    opts.defaultColors = opts.defaultColors[0];
    if (typeof(opts.defaultColors) == "function") {
      //assume this is a d3 scale
      //for now loop through first 20 but need a better way to handle
      defaultColorsArray = [];
      for (var n=0;n<20;n++) {
        defaultColorsArray.push(opts.defaultColors(n));
      };
      opts.defaultColors = defaultColorsArray;
    }
    opts.defaultColors.forEach(function(d,i) {
      opts.defaultColors[i] = new dimple.color(d);
    })
    myChart.defaultColors = opts.defaultColors;
  }  
  
  //do series
  //set up a function since same for each
  //as of now we have x,y,groups,data,type in opts for primary layer
  //and other layers reside in opts.layers
  function buildSeries(layer, hidden){
    //inherit from primary layer if not intentionally changed or xAxis, yAxis, zAxis null
    if (!layer.xAxis) layer.xAxis = opts.xAxis;    
    if (!layer.yAxis) layer.yAxis = opts.yAxis;
    if (!layer.zAxis) layer.zAxis = opts.zAxis;
    
    var x = buildAxis("x", layer);
    x.hidden = hidden;
    
    var y = buildAxis("y", layer);
    y.hidden = hidden;
    
    //z for bubbles
    var z = null;
    if (!(typeof(layer.zAxis) === 'undefined') && layer.zAxis.type){
      z = buildAxis("z", layer);
    };
    
    //here think I need to evaluate group and if missing do null
    //as the group argument
    //if provided need to use groups from layer
    var s = new dimple.series(myChart, null, x, y, z, c, dimple.plot[layer.type], dimple.aggregateMethod.avg, dimple.plot[layer.type].stacked);
    
    //as of v1.1.4 dimple can use different dataset for each series
    if(layer.data){
      //convert to an array of objects
      var tempdata;
      //avoid lodash for now
      datakeys = d3.keys(layer.data)
      tempdata = layer.data[datakeys[1]].map(function(d,i){
        var tempobj = {}
        datakeys.forEach(function(key){
          tempobj[key] = layer.data[key][i]
        })
        return tempobj
      })
      s.data = tempdata;
    }
    
    if(layer.hasOwnProperty("groups")) {
      s.categoryFields = (typeof layer.groups === "object") ? layer.groups : [layer.groups];
      //series offers an aggregate method that we will also need to check if available
      //options available are avg, count, max, min, sum
      if (!(typeof(layer.aggregate) === 'undefined')) {
        s.aggregate = eval(layer.aggregate);
      }
      if (!(typeof(layer.lineWeight) === 'undefined')) {
        s.lineWeight = eval(layer.lineWeight);
      }
      if (!(typeof(layer.barGap) === 'undefined')) {
        s.barGap = eval(layer.barGap);
      }    
    };    
   /* if (!(typeof(layer.eventHandler) === 'undefined')) {
      layer.eventHandler = (layer.eventHandler.length === "undefined") ? layer.eventHandler : [layer.eventHandler];
      layer.eventHandler.forEach(function(evt){
        s.addEventHandler(evt.event, eval(evt.handler))
      })
    }*/
      
    myChart.series.push(s);
    
    /*placeholder fix domain of primary scale for new series data
    //not working right now but something like this
    //for now just use overrideMin and overrideMax from rCharts
    for( var i = 0; i<2; i++) {
      if (!myChart.axes[i].overrideMin) {
        myChart.series[0]._axisBounds(i==0?"x":"y").min = myChart.series[0]._axisBounds(i==0?"x":"y").min < s._axisBounds(i==0?"x":"y").min ? myChart.series[0]._axisBounds(i==0?"x":"y").min : s._axisBounds(i==0?"x":"y").min;
      }
      if (!myChart.axes[i].overrideMax) {  
        myChart.series[0]._axisBounds(i==0?"x":"y")._max = myChart.series[0]._axisBounds(i==0?"x":"y").max > s._axisBounds(i==0?"x":"y").max ? myChart.series[0]._axisBounds(i==0?"x":"y").max : s._axisBounds(i==0?"x":"y").max;
      }
      myChart.axes[i]._update();
    }
    */
    
    return s;
  };
  
  buildSeries(opts, false);
  if (opts.layers.length > 0) {
    opts.layers.forEach(function(layer){
      buildSeries(layer, true);
    })
  }
  //unsure if this is best but if legend is provided (not empty) then evaluate
  if(d3.keys(opts.legend).length > 0) {
    var l =myChart.addLegend();
    d3.keys(opts.legend).forEach(function(d){
      l[d] = opts.legend[d];
    });
  }
  //quick way to get this going but need to make this cleaner
  if(opts.storyboard) {
    myChart.setStoryboard(opts.storyboard);
  };
  myChart.draw();

</script>
    
    
        <script>
          myChart.series[2].shapes
            .transition().duration(10).delay(1000)
              .style("stroke","#AD5277")
              .style("stroke-dasharray",[10,5])
          //delete some of the ticks
          myChart.svg.select(".axis").selectAll(".tick")[0].forEach(function(d,i){
              if (!(+d3.time.format("%Y")(new Date(+d3.select(d).datum())) % 10 == 0)) {
                d.remove()
              }
            })
          myChart.svg.select(".axis").selectAll(".tick text")
            .attr("transform","none")
            .style("text-anchor","middle");
        </script>
          
  </body>
</html>