Scatterplot

Scatterplot sample.

<!DOCTYPE html>
<meta charset="utf-8">
<style>

body {
  font: 10px sans-serif;
}

.axis path,
.axis line {
  fill: none;
  stroke: #000;
  shape-rendering: crispEdges;
}

.dot {
  stroke: #000;
}

</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>

var margin = {top: 20, right: 20, bottom: 30, left: 60},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var formater = d3.time.format("%b %d")
var x = d3.time
    .scale()
    .range([0, width]);

var y = d3.scale.linear()
    .range([height, 0]);

var color = d3.scale.category10();

var xAxis = d3.svg.axis()
    .scale(x)
    .tickFormat(formater)
    .orient("bottom");

var yAxis = d3.svg.axis()
    .scale(y)
    .tickFormat(d => `${d} hours`)
    .orient("left");

var svg = d3.select("body").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

d3.csv("data.csv", function(error, data) {
  if (error) throw error;

data.forEach(function(d) {
    d.punctuality = +d.punctuality;
    var dt = d.ended = new Date(d.ended);
    d.day = new Date(dt.getFullYear() + "/" + (dt.getMonth() + 1) + "/" + dt.getDate());
  });

x.domain(d3.extent(data, function(d) { return d.day; })).nice();
  y.domain(d3.extent(data, function(d) { return d.punctuality; })).nice();

svg.append("g")
      .attr("class", "x axis")
      .attr("transform", "translate(0," + y(0) + ")")
      .call(xAxis)
    .append("text")
      .attr("class", "label")
      .attr("x", width)
      .attr("y", -6)
      .style("text-anchor", "end")
      .text("Day of arrival");

svg.append("g")
      .attr("class", "y axis")
      .call(yAxis)
    .append("text")
      .attr("class", "label")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text("Punctuality")

var dot = svg
    .selectAll("g.dotg")
    .data(data)
    .enter()
    .append("g")
    .attr("class", "dotg")

dot.append("circle")
    .attr("class", "dot")
    .attr("r", 3.5)
    .attr("cx", function(d) { return x(d.day); })
    .attr("cy", function(d) { return y(d.punctuality); })
    .style("fill", function(d) { return color(d.transporter); });
  
  dot.append("title")
    .html(d => d.ended.toLocaleString())

var legend = svg.selectAll(".legend")
      .data(color.domain())
    .enter().append("g")
      .attr("class", "legend")
      .attr("transform", function(d, i) { return "translate(0," + i * 20 + ")"; });

legend.append("rect")
      .attr("x", width - 18)
      .attr("width", 18)
      .attr("height", 18)
      .style("fill", color);

legend.append("text")
      .attr("x", width - 24)
      .attr("y", 9)
      .attr("dy", ".35em")
      .style("text-anchor", "end")
      .text(function(d) { return d; });

});

</script>

https://d3js.org/d3.v3.min.js