Makeover Monday - Gold v Oil

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  <h1>Gold v Oil: 1983 to 2017</h1>
  <p>The gold/oil ratio shows the gap in price between the two commodities. A higher ratio means that gold is over valued compared to the price oil: either gold costs too much, or oil is comparitively cheap.</p>

<p>Since 1983, the gold/oil ratio has increased during periods of financial crisis, as oil prices tend to fall when economic growth is weak, and people look to gold as a safe investment. </p>
  
  <div id="chart"></div>
  
  <h2>Sources</h2>
  <ul>
    <li>Data: Quandl – <a href="https://www.quandl.com/data/WGC/GOLD_DAILY_USD-Gold-Prices-Daily-Currency-USD">Gold Prices</a>, <a href="https://www.quandl.com/data/ODA/POILAPSP_INDEX-Blended-Crude-Oil-Price">Crude Oil Prices</a>, <a href="https://www.quandl.com/data/FRED/CPIAUCSL-Consumer-Price-Index-for-All-Urban-Consumers-All-Items">Consumer Price Index</a></li>
    <li>Interpretation: <a href="https://www.vizwiz.com/2017/04/gold-oil-ratio.html">Andy Kriebel</a>, <a href="https://www.marketwatch.com/story/why-the-goldoil-ratio-could-tip-investors-off-to-the-next-market-storm-2016-02-16"> Marketwatch.com</a>, <a href="https://www.tradingtechnologies.com/blog/2016/11/23/on-the-oil-gold-ratio-why-oils-going-higher/">Trading Technologies</a></li>
	</ul>  
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];
    
    const parseDate = d3.timeParse("%d/%m/%Y");
    const formatDate = d3.timeFormat("%b %Y");
    const formatYear = d3.timeFormat("%Y");
    
    const phases2 = [
      {"date":"1/03/1983", "headline": "NA", "blurb":"NA"},
      {"date":"1/12/1985", "headline": "Falling gold prices", "blurb":"Between 1983 and 1985, the prices of gold and oil dropped, but with gold falling at a greater rate. This led lower than average gold/oil ratios."},
      {"date":"1/07/1990", "headline": "Oil glut", "blurb":"An over supply of oil in the 1980's, with its associated low prices, meant for relatively high gold/oil ratio."},
      {"date":"1/04/1999", "headline": "Recession", "blurb":"The weakened global demand during mid of 1990s saw oil and gold drop to 35 year lows. The gold/oil ratio was relatively stable during this period."},
      {"date":"1/06/2008", "headline": "Afghanistan and Iraq wars", "blurb":"In the 2000s the Afghanistan and Iraq wars pushed up oil to record highs, leading to a low gold/oil ratio."},
      {"date":"1/2/2017", "headline": "Global financial crisis", "blurb":"Since July 2008, the price of gold has risen to its peak price for the period, while the price of oil has dropped. "}
    ];

var heading = (i) + ". " + phases2[i].headline + " (" + startDate + " to " + endDate + ")";

div.append("h2").text(heading);

div.append("p").text(phases2[i].blurb);

commodity.forEach(function(c){

div.append("h3")
          .text(capitalise(c) + ":");

var chart = div.append("svg")
          .attr("width", "100%")
      .attr("viewBox", "0 0 "+ (width + margin.left + margin.right) + " " + (height + margin.top + margin.bottom) )
        .attr("preserveAspectRatio", "xMidYMid meet")
          .append("g")
            .attr("transform", "translate(" + margin.left + "," + margin.top + ")");

//ADD AREA AND LINES
          chart.append("path")
            .datum(d.values)
            .attr("fill", function(){ return colour(c); })
            .style("stroke", "none")
            .style("opacity", 0.3)
            .attr("d", area[c]);

chart.append("path")
            .datum(d.values)
            .attr("fill", "none")
            .style("stroke", function(){ return colour(c); })
            .attr("d", line[c]);

//ADD MIN AND MAX LINES PER CHART

if (c == "ratio") {

if (i == 1) {
              chart.append("text")
              .text("AVG ($" + roundNumber(avgRatio) + ")" )
              .attr("x", width/2)
              .attr("y", yScale[c](avgRatio)- 4)
              .style("text-anchor", "middle")
              .attr("fill", function(){ return colour(c); });

}

chart.append("line")
            .attr("class", "minmax")
            .attr("x1",0)
            .attr("y1",yScale[c](avgRatio))
            .attr("x2",width)
            .attr("y2",yScale[c](avgRatio))
            .style("stroke", function(){ return colour(c); })
            .style("fill", "none");

};

var firstValue = roundNumber(thisData[0][c]);
          var lastValue = roundNumber(thisData[thisDataLength-1][c]);

chart.append("text")
            .text("$"+firstValue)
            .attr("x", -2)
            .attr("y", yScale[c](firstValue) + 4)
            .style("text-anchor", "end")
            .attr("fill", function(){ return colour(c);});

chart.append("text")
            .text("$"+lastValue)
            .attr("x", width + 2)
            .attr("y", yScale[c](lastValue) + 4)
            .style("text-anchor", "start")
            .attr("fill", function(){ return colour(c);});

chart.append("text")
            .text("MAX ($" + roundNumber(extent[c][1]) + ")")
            .attr("x", width/2)
            .attr("y", -3)
            .style("text-anchor", "middle")
            .attr("fill", function(){ return colour(c); });

chart.append("text")
            .text("MIN ($" + roundNumber(extent[c][0]) + ")")
            .attr("x", width/2)
            .attr("y", yScale[c](extent[c][0]) + 11)
            .style("text-anchor", "middle")
            .attr("fill", function(){ return colour(c); });

chart.append("line")
            .attr("class", "minmax")
            .attr("x1",0)
            .attr("y1",yScale[c](extent[c][0]))
            .attr("x2",width)
            .attr("y2",yScale[c](extent[c][0]))
            .style("stroke", function(){ return colour(c); });

chart.append("line")
            .attr("class", "minmax")
            .attr("x1",0)
            .attr("y1",yScale[c](extent[c][1]))
            .attr("x2",width)
            .attr("y2",yScale[c](extent[c][1]))
            .style("stroke", function(){ return colour(c); });

//ADD AXIS

chart.append("text")
            .text(startDate)
            .attr("x", 0)
            .attr("y", height + 20)
            .attr("fill", "grey");

chart.append("text")
            .text(endDate)
            .attr("x", width)
            .attr("y", height + 20)
            .style("text-anchor", "end")
            .attr("fill", "grey");

chart.append("line")
            .attr("x1",0)
            .attr("y1",height)
            .attr("x2",width)
            .attr("y2",height)
            .attr("stroke-width", 1)
            .style("stroke", "lightgrey")
            .style("fill", "none");
        
        
      	})
        
      };

});
    
    
    function roundNumber(n) {
      //var roundedNumber =  Math.round(n * 100);
      //return roundedNumber/100;
      return Math.round(n);
    };
    
    //https://paulund.co.uk/capitalize-first-letter-string-javascript
    function capitalise(string) {
    	return string.charAt(0).toUpperCase() + string.slice(1);
		}

</script>
</body>

https://d3js.org/d3.v4.min.js