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@ndarville
Last active October 19, 2015 18:11
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Sample size and standard error
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date A B C F I K O V Ø respondents
2012/01 29.02 9.27 4.27 6.11 4.76 0.72 13.70 22.42 9.64 1000
2012/02 29.24 8.60 4.09 6.21 4.81 0.65 14.03 22.33 9.94 1000
2012/03 29.91 8.56 3.49 6.53 5.02 0.52 14.45 21.82 9.48 1000
2012/04 29.91 8.56 3.49 6.53 5.02 0.52 14.45 21.82 9.48 1000
2012/05 29.91 8.56 3.49 6.53 5.02 0.52 14.45 21.82 9.48 1000
2012/06 19.96 8.50 3.96 6.12 4.61 0.57 14.34 32.63 9.24 1000
2012/07 19.60 9.94 3.64 6.61 3.90 0.66 14.30 31.83 9.39 1000
2012/08 18.55 8.62 3.52 4.85 5.15 0.52 16.18 31.16 11.32 1000
2012/09 17.03 8.19 3.88 3.97 5.22 0.57 16.34 31.72 13.06 1000
2012/10 16.75 8.19 4.17 4.48 5.39 0.51 15.48 31.46 13.34 1000
2012/11 17.73 8.35 4.54 4.74 5.32 0.53 15.98 30.28 12.34 1000
2012/12 19.26 8.75 3.75 6.07 5.08 0.52 15.31 30.93 10.23 1000
2013/01 28.68 8.28 4.31 4.71 5.02 0.48 16.61 19.73 11.93 1000
2013/02 28.57 8.54 3.93 4.81 5.82 0.42 18.12 18.72 10.97 1000
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<style>
body {
font: 10px sans-serif;
}
svg {
margin-left: auto; margin-right: auto;
display: block;
}
line,
rect {
shape-rendering: crispEdges;
}
.axis path,
.axis line {
fill: none;
stroke: #000;
shape-rendering: crispEdges;
}
.x.axis path {
display: none;
}
.divider {
stroke: #777;
stroke-dasharray: 5,5;
opacity: 0.7;
}
.line {
fill: none;
stroke-width: 1.5px;
}
circle.dot {
fill: #FFF;
stroke-width: 1.5px;
}
.area.confidence {
zoom: 1;
filter: alpha(opacity=30);
opacity: 0.3;
}
/**
.area.above {
fill: #D7191C !important;
}
.area.below {
fill: #2B83BA !important;
}
*/
</style>
</head>
<body>
<!-- <script src="http://d3js.org/d3.v3.min.js"></script> -->
<script src="d3.min.js?v=3.2.8"></script>
<script type="text/javascript"charset="utf-8">
// Return standard error with 95% confidence
function se95(p, n) {
return Math.sqrt(p*(1-p)/n)*1.96;
};
// Settings
var width = 440,
height = 400,
padding = 30;
var margin = {
'top': 30,
'right': 35,
'bottom': 30,
'left': 30
};
margin.hor = margin.left + margin.right;
margin.ver = margin.top + margin.bottom;
// Config
var dataset = "data.csv",
parseDate = d3.time.format("%Y/%m").parse,
electionDate = "", // "2014/11"
interpolation = "linear";
var coalitionLeft = ["A", "B", "F", "Ø"],
coalitionLeftColor = "#D7191C", // blue
coalitionRight = ["V", "O", "K", "I", "C"],
coalitionRightColor = "#2B83BA", // red
displaySingleCoalition = false;
// false, "left", "right"
var useCoalitionLabels = true,
yAxisTitle = "Votes (%)",
cutoff = 50;
if (useCoalitionLabels === true) { margin.right = 50; }
// for the labels; 40 + 10 for each array.length > 4
var x = d3.time.scale()
.range([0, width]);
var y = d3.scale.linear()
.range([height, 0]);
var xAxis = d3.svg.axis()
.scale(x)
.orient("bottom")
.ticks(7)
.tickSubdivide(2);
var yAxis = d3.svg.axis()
.scale(y)
.orient("left")
.tickFormat(d3.format(".0%"));
var lineLeft = d3.svg.area()
.interpolate(interpolation)
.x(function(d) { return x(d["date"]); })
.y(function(d) { return y(d["left"]); });
var lineRight = d3.svg.area()
.interpolate(interpolation)
.x(function(d) { return x(d["date"]); })
.y(function(d) { return y(d["right"]); });
var confidenceAreaLeft = d3.svg.area()
.interpolate(interpolation)
.x(function(d) { return x(d["date"]); })
.y0(function(d) {
return y(d["left"] - d["confidenceRight"]); })
.y1(function(d) {
return y(d["left"] + d["confidenceRight"]); });
var confidenceAreaRight = d3.svg.area()
.interpolate(interpolation)
.x(function(d) { return x(d["date"]); })
.y0(function(d) {
return y(d["right"] - d["confidenceRight"]); })
.y1(function(d) {
return y(d["right"] + d["confidenceRight"]); });
var svg = d3.select("body").append("svg")
.attr({
"width": width + margin.left + margin.right,
"height": height + margin.top + margin.bottom
})
.append("g")
.attr("transform", "translate(" + margin.left + "," + margin.top + ")");
d3.csv(dataset, function(error, data) {
data.forEach(function(d) {
d.date = parseDate(d.date);
d.respondents = parseFloat(d.respondents);
coalitionSum = function(d, coalition) {
var votes = parseFloat(0);
for (var i = 0; i < coalition.length; i++) {
votes += parseFloat(d[coalition[i]])
}
// Return percentage in decimal format
return votes>1 ? votes/100 : votes;
};
d["left"] = coalitionSum(d, coalitionLeft),
d["right"] = coalitionSum(d, coalitionRight),
d["total"] = d["left"] + d["right"],
d["confidenceLeft"] = se95(d["left"], d["respondents"]),
d["confidenceRight"] = se95(d["right"], d["respondents"]);
});
if (electionDate === "") {
x.domain(d3.extent(data, function(d) {
return d.date; }));
} else {
x.domain([
d3.min(data, function(d) { return d.date; }),
parseDate(electionDate)
]);
}
y.domain([
d3.min(data, function(d) {
var min = Math.min(d["right"], d["left"]);
return min - se95(min, d["respondents"]);
}),
d3.max(data, function(d) {
var max = Math.max(d["right"], d["left"]);
return max + se95(max, d["respondents"]);
})
]);
svg.datum(data);
// X axis
svg.append("g")
.attr({
"class": "x axis",
"transform": "translate(0," + height + ")"
})
.call(xAxis);
// Y axis
svg.append("g")
.attr("class", "y axis")
.call(yAxis)
.append("text")
.attr({
"transform": "rotate(-90)",
"y": 6,
"dy": ".71em"
})
.style("text-anchor", "end")
.text(yAxisTitle);
// Confidence area
if (displaySingleCoalition !== "right") {
svg.append("path")
.attr({
"class": "area confidence",
"fill": coalitionLeftColor,
"d": confidenceAreaLeft
});
}
if (displaySingleCoalition !== "left") {
svg.append("path")
.attr({
"class": "area confidence",
"fill": coalitionRightColor,
"d": confidenceAreaRight
});
}
// Lines
if (displaySingleCoalition !== "right") {
svg.append("path")
.attr({
"class": "line",
"d": lineLeft,
"stroke": coalitionLeftColor
});
}
if (displaySingleCoalition !== "left") {
svg.append("path")
.attr({
"class": "line",
"d": lineRight,
"stroke": coalitionRightColor
});
}
// Dots
var dots = svg.selectAll("circle")
.data(data)
.enter();
if (displaySingleCoalition !== "right") {
var dotsLeft = dots.append("circle")
.attr({
"class": "dot",
"r": 3,
"cx": lineLeft.x(),
"cy": lineLeft.y(),
"stroke": coalitionLeftColor
});
}
if (displaySingleCoalition !== "left") {
var dotsRight = dots.append("circle")
.attr({
"class": "dot",
"r": 3,
"cx": lineRight.x(),
"cy": lineRight.y(),
"stroke": coalitionRightColor
});
}
// Divider
svg.append("line")
.attr("class", "divider")
.attr({
"x1": x.range()[0],
"x2": x.range()[1],
"y1": y(cutoff),
"y2": y(cutoff)
});
// Graph label
if (useCoalitionLabels === true) {
if (displaySingleCoalition !== "right") {
svg.append("text")
.data(data)
.attr("transform", function(d) {
return "translate(" + x(data[data.length-1]["date"]) + "," + y(data[data.length-1]["left"]) + ")"; })
.attr({
"x": 10,
"dy": ".35em",
"class": "label",
"id": "coalitionLeft"
})
.text(coalitionLeft.join(""));
}
if (displaySingleCoalition !== "left") {
svg.append("text")
.data(data)
.attr("transform", function(d) {
return "translate(" + x(data[data.length-1]["date"]) + "," + y(data[data.length-1]["right"]) + ")"; })
.attr({
"x": 10,
"dy": ".35em",
"class": "label",
"id": "coalitionRight"
})
.text(coalitionRight.join(""));
}
}
});
</script>
</body>
</html>
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