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<!DOCTYPE html> |
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<meta charset="utf-8"> |
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<style> |
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#controls{ |
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position: absolute; |
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right: 0px; |
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} |
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.grid>line, .grid>.intersect { |
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fill: none; |
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stroke: #ddd; |
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shape-rendering: crispEdges; |
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vector-effect: non-scaling-stroke; |
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} |
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.axis path, |
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.axis line { |
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fill: none; |
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stroke: black; |
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shape-rendering: crispEdges; |
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} |
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.axis text { |
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font-family: sans-serif; |
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font-size: 11px; |
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} |
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.timeline { |
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fill: none; |
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stroke: steelblue; |
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stroke-width: 2px; |
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opacity: 0.2; |
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} |
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.timeline.draggable:hover, .timeline.dragging { |
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stroke: pink; |
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opacity: 1; |
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cursor: ns-resize; |
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} |
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.dot { |
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fill: lightsteelblue; |
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stroke: white; |
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stroke-width: 3px; |
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} |
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.dot.draggable:hover, .dot.dragging { |
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fill: pink; |
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cursor: ns-resize; |
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} |
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.trend { |
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stroke: steelblue; |
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} |
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.ci { |
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fill: steelblue; |
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fill-opacity: 0.1; |
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} |
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</style> |
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<body> |
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<div id="controls"> |
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<button onclick="invertTrend();">invert trend</button> |
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<button onclick="disperse();">increase dispersion</button> |
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<button onclick="concentrate();">decrease dispersion</button> |
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<button onclick="makeOutlier();">make outlier</button> |
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</div> |
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<script src="//d3js.org/d3.v3.min.js"></script> |
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<script> |
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var rawTimeSerie = [] |
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var timeSerie = []; |
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var trend = 0; |
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var interception = 0; |
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var WITH_TRANSITION = true; |
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var WITHOUT_TRANSITION = false |
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var duration = 500; |
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var xAxisLabelHeight= 20; |
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var yAxisLabelWidth= 20; |
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var margin = {top: 20, right: 20, bottom: (20+xAxisLabelHeight), left: (20+yAxisLabelWidth)}, |
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width = 960 - margin.left - margin.right, |
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height = 500 - margin.top - margin.bottom; |
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var drag = d3.behavior.drag() |
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.origin(function(d) { return d; }) |
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.on("dragstart", dragStarted) |
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.on("drag", dragged) |
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.on("dragend", dragEnded); |
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var dragTimeline= d3.behavior.drag() |
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.origin(function(d) { return d; }) |
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.on("dragstart", dragStarted) |
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.on("drag", draggedTimeline) |
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.on("dragend", dragEnded); |
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var x = d3.scale.linear() |
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.domain([0, 20]) |
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.range([0, width]) |
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var y = d3.scale.linear() |
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.domain([0, 50]) |
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.range([0, -height]) |
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var xAxisDef = d3.svg.axis() |
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.scale(x); |
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var yAxisDef = d3.svg.axis() |
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.scale(y) |
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.orient("left"); |
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var svg = d3.select("body").append("svg") |
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.attr("width", width + margin.left + margin.right) |
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.attr("height", height + margin.top + margin.bottom) |
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.append("g") |
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.attr("transform", "translate(" + (margin.left) + "," + (height+margin.top) + ")") |
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var container = svg.append("g"); |
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var grid = container.append("g") |
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.attr("class", "grid"); |
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var intersects = []; |
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d3.range(1, x.invert(width)).forEach(function(a) { d3.range(5, y.invert(-height),5).forEach(function(b) { intersects.push([a,b])})}); |
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grid.selectAll(".intersect") |
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.data(intersects) |
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.enter().append("path") |
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.classed("intersect", true) |
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.attr("d", function(d) { return "M"+[x(d[0])-1,y(d[1])]+"h3M"+[x(d[0]),y(d[1])-1]+"v3"}); |
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container.append("g") |
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.attr("class", "axis x") |
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.call(xAxisDef); |
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container.append("text") |
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.attr("x", width) |
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.attr("y", -6) |
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.style("text-anchor", "end") |
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.text("Time"); |
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container.append("g") |
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.attr("class", "axis y") |
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.call(yAxisDef); |
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container.append("text") |
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.attr("x", 6) |
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.attr("y", -height+10) |
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.style("text-anchor", "start") |
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.text("Amount"); |
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var CIArea = container.append("path") |
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.attr("class", "ci") |
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.attr("d", "M"+[x(0),y(20)]+"L"+[x(20),y(20)]+"v"+(y(-10))+"L"+[x(0),y(10)]+"Z"); |
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var timeline = container.append("path") |
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.classed("timeline draggable", true) |
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.attr("d", line) |
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.call(dragTimeline); |
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var dotContainer = container.append("g") |
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.classed("dots", true); |
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var trendLine = container.append("line") |
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.attr("class", "trend") |
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.attr("x1", x(0)) |
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.attr("y1", y(0)) |
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.attr("x2", x(20)) |
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.attr("y2", y(0)); |
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d3.csv("timeserie.csv", dottype, function(error, dots) { |
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updateTimeline(WITHOUT_TRANSITION); |
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updateDots(WITHOUT_TRANSITION); |
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updateTrendAndCI(WITHOUT_TRANSITION); |
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}); |
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function dottype(d) { |
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d.x = +d.x; |
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d.y = +d.y; |
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rawTimeSerie.push(d); |
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timeSerie.push(d); |
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return d; |
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} |
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var line = d3.svg.line() |
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.x(function(d) { return x(d.x); }) |
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.y(function(d) { return y(d.y); }); |
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function updateDots(withTransition) { |
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dots = dotContainer.selectAll(".dot") |
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.data(timeSerie); |
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dots.enter() |
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.append("circle") |
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.classed("dot draggable", true) |
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.attr("r", 5) |
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.attr("cx", function(d) { return x(d.x); }) |
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.call(drag); |
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dots.transition() |
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.duration(withTransition? duration : 0) |
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.attr("cy", function(d) { return y(d.y); }) |
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} |
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function updateTimeline(withTransition) { |
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timeline.data(timeSerie).transition() |
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.duration(withTransition? duration : 0) |
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.attr("d", line(timeSerie)); |
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} |
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function updateTrendAndCI(withTransition) { |
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// The objective is to draw a line that is the closest line from each point |
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// (cf. https://en.wikipedia.org/wiki/Linear_regression) |
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// A simple regression line is of the form y=ax+b, where a is the trend of the time serie |
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// below code computes 'a' and 'b' |
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//furthermore, to compute the CI, we have to compute the standard deviation |
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var serieLength = timeSerie.length; |
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var timeInterval = 1 |
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var countSum = 0; |
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var squareCountSum = 0; |
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var orderCountSum = 0; |
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timeSerie.forEach(function(d){ |
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countSum += d.y; |
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squareCountSum += (d.y)*(d.y); |
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orderCountSum += (d.x)*(d.y); |
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}); |
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var a = (12*orderCountSum - 6*(serieLength+1)*countSum)/(timeInterval*serieLength*(serieLength-1)*(serieLength+1)); |
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var b = (2*(2*serieLength+1)*countSum - 6*orderCountSum)/(serieLength*(serieLength-1)); |
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trend = a; |
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interception = b; |
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var variance = ( squareCountSum |
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- 2*b*countSum |
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- 2*a*orderCountSum |
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+ serieLength*(b*b) |
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+ b*a*serieLength*(serieLength+1) |
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+ ((a*a)*serieLength*(serieLength+1)*(2*serieLength+1))/6 |
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) / serieLength |
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var stdDev = Math.sqrt(variance) |
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var confidence = 1.96*stdDev |
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//drawing |
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trendLine |
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.transition() |
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.duration(withTransition? duration : 0) |
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.attr("y1", y(b)) |
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.attr("y2", y(a*serieLength+b)); |
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CIArea |
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.transition() |
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.duration(withTransition? duration : 0) |
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.attr("d", "M"+[x(0),y(b+confidence)]+"L"+[x(20),y(a*serieLength+b+confidence)]+"v"+(y(-2*confidence))+"L"+[x(0),y(b-confidence)]+"Z"); |
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} |
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function invertTrend() { |
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var serieLength = timeSerie.length; |
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var countSum = 0; |
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var mean = 0; |
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timeSerie.forEach(function (d) { |
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countSum += d.y |
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}); |
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mean = countSum/serieLength; |
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timeSerie.forEach(function (d) { |
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d.y = (mean-d.y)+mean; |
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}); |
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updateTimeline(WITH_TRANSITION); |
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updateDots(WITH_TRANSITION); |
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updateTrendAndCI(WITH_TRANSITION); |
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} |
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function changeDispersion(scale) { |
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var serieLength = timeSerie.length; |
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var timeInterval = 1; |
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var ySum = 0; |
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var timeYSum = 0; |
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timeSerie.forEach(function(d){ |
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ySum += d.y; |
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timeYSum += d.x*d.y; |
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}); |
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var trend = (12*timeYSum - 6*(serieLength+1)*ySum)/(timeInterval*serieLength*(serieLength-1)*(serieLength+1)); |
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var intercept = (2*(2*serieLength+1)*ySum - 6*timeYSum)/(serieLength*(serieLength-1)); |
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var expected; |
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timeSerie.forEach(function(d){ |
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expected = d.x*trend + intercept; |
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d.y = expected + scale*(d.y-expected); |
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}); |
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updateTimeline(WITH_TRANSITION); |
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updateDots(WITH_TRANSITION); |
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updateTrendAndCI(WITH_TRANSITION); |
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} |
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function disperse(serieName) { |
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changeDispersion(1.6) |
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} |
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function concentrate(serieName) { |
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changeDispersion(0.625) |
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} |
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function makeOutlier() { |
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if (trend > 0) { |
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timeSerie[18].y = 5; |
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} else { |
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timeSerie[18].y = 45; |
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} |
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updateTimeline(WITH_TRANSITION); |
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updateDots(WITH_TRANSITION); |
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updateTrendAndCI(WITH_TRANSITION); |
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} |
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function dragStarted(d) { |
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d3.select(this).classed("dragging", true); |
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} |
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function dragged(d) { |
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d.y += y.invert(d3.event.dy) |
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d3.select(this).attr("cy", y(d.y)); |
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updateTimeline(WITHOUT_TRANSITION); |
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updateDots(WITHOUT_TRANSITION); |
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updateTrendAndCI(WITHOUT_TRANSITION); |
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} |
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function dragEnded(d) { |
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d3.select(this).classed("dragging", false); |
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} |
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function draggedTimeline(d) { |
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var rawdy = y.invert(d3.event.dy); |
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timeSerie.forEach(function(d){ |
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d.y += rawdy; |
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}); |
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updateTimeline(WITHOUT_TRANSITION); |
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updateDots(WITHOUT_TRANSITION); |
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updateTrendAndCI(WITHOUT_TRANSITION); |
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} |
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</script> |
