(This chart is a part of the d3-charts collection available here.)
This chart displays the share of votes over time between two Danish parliamentary coalitions using placeholder data. The chart here has been used for two coalitions, but can also be used for two candidates.
You will notice something enveloping the line charts, which is the confidence interval, which indicates the spectrum of the confidence in our displayed results—to use a completely unscientific definition.
Compare this to Sam Wang’s chart for the U.S. 2012 election and Drew Linzer’s charts for individual states.
All parameters are in the top of the script under // Config. If we use the example script:
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; }parseDate refers to the date format—in this case YYYY/MM.electionDate refers to the date of the election, if known. This will change the maximum on the x-axis to said date to contextualize the trends.interpolation refers to the “smoothing” of the graphs. More info here.coalitionLeft/coalitionRight refer to the letters of each member party of a coalition, entered as strings in an array.useCoalitionLabels refers to whether the developer wishes to display a coalition name (made by concatenating all its parties’ letters) at the end of the respective graph.displaySingleCoalition refers to the fact that elections are often a zero-sum game. This option allows you to display just one of the two coalitions.cutoff refers to the % at which the dotted divider should be set. In some cases, 50% may not be the desired value.The other parameters should be self-explanatory.
The data should have a column with (1) a date, one for (2) each party or candidate, and one for (3) the number of respondents.
forked from ndarville‘s block: Confidence Interval