+ <p>A couple things to notice about this chart:</p>
+
+ <ul>
+ <li>The error bars for Ichiro's batting average are larger than for the Mariners', since he has far fewer at bats than his team.</li>
+ <li>dygraphs makes it easy to see "batting average over the last 30 games". This is ordinarily quite difficult to compute. It makes it clear where the "hot" and "cold" part of Suzuki's season were.</li>
+ <li>If you set the averaging period to something large, like 200, you'll see the team's and player's batting average through that game. The final number is the overall batting average for the season.</li>
+ <li>Where the error bars do not overlap, we can say with 95% confidence that the series differ. There is a better than 95% chance that Ichiro was a better hitter than his team as a whole in 2004, the year he won the batting title.</li>
+ </ul>
+
+ <h2 id="stock">One last demo</h2>
+
+ <p>This chart shows monthly closes of the Dow Jones Industrial Average, both in nominal and real (i.e. adjusted for inflation) dollars. The shaded areas show its monthly high and low. CPI values with a base from 1982-84 are used to adjust for inflation.</p>
+
+ <div id="dow_chart" style="width:900px; height:350px;"></div>
+ <script type="text/javascript">
+ // From http://www.econstats.com/eqty/eq_d_mi_3.csv
+ new Dygraph(
+ document.getElementById('dow_chart'),
+ "dow.txt",
+ {
+ showRoller: true,
+ customBars: true,
+ labelsKMB: true
+ }
+ );
+ </script>
+<!--
+
+Here is a script to regenerate the Dow Jones plot:
+
+# Get unadjusted DJIA data in a nice format:
+curl -O http://www.econstats.com/eqty/eq_d_mi_3.csv
+sed '1,17d' eq_d_mi_3.csv | cut -d, -f1,6 | perl -pe 's/(\d{4}-\d\d)-\d\d/$1/g' | perl -pe 's/, */\t/' | grep -v 'na' | perl -ne 'chomp; ($m,$v) = split/\t/; $close{$m} = $v; if ($low{$m} == 0 || $v < $low{$m}) { $low{$m}=$v } if ($v > $high{$m}) { $high{$m} = $v } END { for $x(sort keys %close) { print "$x\t$low{$x}\t$close{$x}\t$high{$x}\n" } } ' > monthly-djia.tsv
+
+# Fetch and format the CPI data:
+curl 'http://data.bls.gov/PDQ/servlet/SurveyOutputServlet?series_id=CUUR0000SA0&years_option=all_years&periods_option=all_periods&output_type=column&output_format=text&delimiter=comma' > cpi-u.txt
+sed '1,/Series Id,Year,/d' cpi-u.txt | sed '/^$/,$d' | cut -d, -f2,3,4 | perl -ne 'print if /,M(0[0-9]|1[012]),/' | perl -pe 's/(\d{4}),M(\d{2}),/$1-$2\t/g' > cpi-u.tsv
+
+# Merge:
+join -t' ' cpi-u.tsv monthly-djia.tsv > annotated-djia.tsv
+perl -ne 'BEGIN{print "Month,Nominal,Real\n"} chomp; ($m,$cpi,$low,$close,$high) = split /\t/; $cpi /= 100.0; print "$m-15,$low;$close;$high,",($low/$cpi),";",($close/$cpi),";",($high/$cpi),"\n"' annotated-djia.tsv > dow.txt
+
+-->
+
+ <h2 id="options">Other Options</h2>
+
+ <p>These are the options that can be passed in through the optional third parameter of the Dygraph constructor. To see demonstrations of many of these options, browse the <a href="tests/">dygraphs tests</a> directory.</p>
+
+ <table class="thinborder" width="900">
+ <thead>
+ <tr>
+ <th width="150">Name</th>
+ <th>Values</th>
+ <th>Default</th>
+ <th width="150">Description</th>
+ </tr>
+ </thead>
+ <tbody>
+ <tr>
+ <td><strong>includeZero</strong></td>
+ <td><code>boolean</code></td>
+ <td><code>false</code></td>
+ <td>Usually, dygraphs will use the range of the data plus some padding to set the range of the y-axis. If this option is set, the y-axis will always include zero, typically as the lowest value. This can be used to avoid exaggerating the variance in the data.</td>
+ </tr>
+ <tr>
+ <td><strong>rollPeriod</strong></td>
+ <td><code>integer >= 1</code></td>
+ <td><code>1</code></td>
+ <td>Number of days over which to average data. Discussed extensively above.</td>
+ </tr>
+ <tr>
+ <td><strong>showRoller</strong></td>
+ <td><code>boolean</code></td>
+ <td><code>false</code></td>
+ <td>If the rolling average period text box should be shown.</td>
+ </tr>
+ <tr>
+ <td><strong>colors</strong></td>
+ <td><code>['red', '#00FF00']</code></td>
+ <td><code></code></td>
+ <td>List of colors for the data series. These can be of the form "#AABBCC" or "rgb(255,100,200)" or "yellow", etc. If not specified, equally-spaced points around a color wheel are used.</td>
+ </tr>
+ <tr>
+ <td><strong>colorSaturation</strong></td>
+ <td><code>0.0 - 1.0</code></td>
+ <td><code>1.0</code></td>
+ <td>If <strong>colors</strong> is not specified, saturation of the automatically-generated data series colors.</td>
+ </tr>
+ <tr>
+ <td><strong>colorValue</strong></td>
+ <td><code>float (0.0 — 1.0)</code></td>
+ <td><code>1.0</code></td>
+ <td>If colors is not specified, value of the data series colors, as in hue/saturation/value. (0.0-1.0, default 0.5)</td>
+ </tr>
+ <tr>
+ <td><strong>clickCallback</strong></td>
+ <td><code>function(e, date){<br> alert(date);<br>}</code></td>
+ <td><code>null</code></td>
+ <td>A function to call when a data point is clicked. The function should take two arguments, the event object for the click and the date that was clicked. (default null)</td>
+ </tr>
+ <tr>
+ <td><strong>zoomCallback</strong></td>
+ <td><code>function(minDate, maxDate){}</code></td>
+ <td><code>null</code></td>
+ <td>A function to call when the zoom window is changed (either by zooming in or out). minDate and maxDate are milliseconds since epoch.</td>
+ </tr>
+ <tr>
+ <td><strong>strokeWidth</strong></td>
+ <td><code>integer</code></td>
+ <td><code>1</code></td>
+ <td>Width of the data lines. This can be used to increase the contrast or some graphs.</td>
+ </tr>
+ <tr>
+ <td><strong>dateWindow</strong></td>
+ <td><code>[<br> Date.parse('2006-01-01'),<br> (new Date()).valueOf()<br>]</code></td>
+ <td rowspan="2"><code>Full range of the input is shown</code></td>
+ <td>Initially zoom in on a section of the graph. Is of the form [earliest, latest], where earliest/latest are milliseconds since epoch.</td>
+ </tr>
+ <tr>
+ <td><strong>valueRange</strong></td>
+ <td><code>[10, 110]</code></td>
+ <td>Explicitly set the vertical range of the graph to [low, high].</td>
+ </tr>
+ <tr>
+ <td><strong>labelsSeparateLines</strong></td>
+ <td><code>boolean</code></td>
+ <td><code>false</code></td>
+ <td>Put <code><br/></code> between lines in the label string. Often used in conjunction with <strong>labelsDiv</strong>.</td>
+ </tr>
+ <tr>
+ <td><strong>labelsDiv</strong></td>
+ <td><code>document.getElementById('foo')</code></td>
+ <td><code>null</code></td>
+ <td>Show data labels in an external div, rather than on the graph.</td>
+ </tr>
+ <tr>
+ <td><strong>labelsKMB</strong></td>
+ <td><code>true</code></td>
+ <td><code>false</code></td>
+ <td>Show K/M/B for thousands/millions/billions on y-axis.</td>
+ </tr>
+ <tr>
+ <td><strong>labelsKMG2</strong></td>
+ <td><code>true</code></td>
+ <td><code>false</code></td>
+ <td>Show k/M/G for kilo/Mega/Giga on y-axis. This is different than
+ <code>labelsKMB</code> in that it uses base 2, not 10.</td>
+ </tr>
+ <tr>
+ <td><strong>labelsDivWidth</strong></td>
+ <td><code>250</code></td>
+ <td><code></code></td>
+ <td>Width (in pixels) of the div which shows information on the currently-highlighted points.</td>
+ </tr>
+ <tr>
+ <td><strong>labelsDivStyles</strong></td>
+ <td><code>{}</code></td>
+ <td><code>null</code></td>
+ <td>Additional styles to apply to the currently-highlighted points div. For example, { 'font-weight': 'bold' } will make the labels bold.</td>
+ </tr>
+ <tr>
+ <td><strong>highlightCircleSize</strong></td>
+ <td><code>integer</code></td>
+ <td><code>3</code></td>
+ <td>The size in pixels of the dot drawn over highlighted points.</td>
+ </tr>
+ <tr>
+ <td><strong>drawPoints</strong></td>
+ <td><code>boolean</code></td>
+ <td><code>false</code></td>
+ <td>Draw a small dot at each point, in addition to a line going through the point. This makes the individual data points easier to see, but can increase visual clutter in the chart.</td>
+ </tr>
+ <tr>
+ <td><strong>pointSize</strong></td>
+ <td><code>interger</code></td>
+ <td><code>1</code></td>
+ <td>The size of the dot to draw on each point in pixels (see drawPoints). A dot is always drawn when a point is "isolated", i.e. there is a missing point on either side of it. This also controls the size of those dots.</td>
+ </tr>
+ <tr>
+ <td><strong>pixelsPerXLabel</strong></td>
+ <td rowspan="2"><code>integer</code></td>
+ <td><code>60</code></td>
+ <td rowspan="2">Number of pixels to require between each x- and y-label. Larger values will yield a sparser axis with fewer ticks.</td>
+ </tr>
+ <tr>
+ <td><strong>pixelsPerYLabel</strong></td>
+ <td><code>30</code></td>
+ </tr>
+ <tr>
+ <td><strong>xAxisLabelWidth</strong></td>
+ <td rowspan="2"><code>integer</code></td>
+ <td><code></code></td>
+ <td rowspan="2">Width (in pixels) of the x- and y-axis labels.</td>
+ </tr>
+ <tr>
+ <td><strong>yAxisLabelWidth</strong></td>
+ <td><code></code></td>
+ </tr>
+ <tr>
+ <td><strong>axisLabelFontSize</strong></td>
+ <td><code>integer</code></td>
+ <td><code>14</code></td>
+ <td>Size of the font (in pixels) to use in the axis labels, both x- and y-axis.</td>
+ </tr>
+ <tr>
+ <td><strong>rightGap</strong></td>
+ <td><code>integer</code></td>
+ <td><code></code></td>
+ <td>Number of pixels to leave blank at the right edge of the Dygraph. This makes it easier to highlight the right-most data point.</td>
+ </tr>
+ <tr>
+ <td><strong>errorBars</strong></td>
+ <td><code>boolean</code></td>
+ <td><code>false</code></td>
+ <td>Does the data contain standard deviations? Setting this to true alters the input format (see above).</td>
+ </tr>
+ <tr>
+ <td><strong>sigma</strong></td>
+ <td><code>integer</code></td>
+ <td><code></code></td>
+ <td>When errorBars is set, shade this many standard deviations above/below each point.</td>
+ </tr>
+ <tr>
+ <td><strong>fractions</strong></td>
+ <td><code>boolean</code></td>
+ <td><code>false</code></td>
+ <td>When set, attempt to parse each cell in the CSV file as "a/b", where a and b are integers. The ratio will be plotted. This allows computation of Wilson confidence intervals (see below).</td>
+ </tr>
+ <tr>
+ <td><strong>wilsonInterval</strong></td>
+ <td><code>boolean</code></td>
+ <td><code>true</code></td>
+ <td>Use in conjunction with the "fractions" option. Instead of plotting +/- N standard deviations, dygraphs will compute a Wilson confidence interval and plot that. This has more reasonable behavior for ratios close to 0 or 1.</td>
+ </tr>
+ <tr>
+ <td><strong>customBars</strong></td>
+ <td><code>boolean</code></td>
+ <td><code>false</code></td>
+ <td>When set, parse each CSV cell as "low;middle;high". Error bars will be drawn for each point between low and high, with the series itself going through middle.</td>
+ </tr>
+ </tbody>
+ </table>
+
+ <h2>Common Gotchas</h2>
+
+ <p>Here are a few problems that I've frequently run into while using the dygraphs library.</p>
+
+ <ul>
+ <li>Make sure your CSV files are readable! If your graph isn't showing up, the XMLHttpRequest for the CSV file may be failing. You can determine whether this is the case using tools like <a href="http://www.getfirebug.com/">Firebug</a>.</li>
+ <li>Make sure your CSV files are in the correct format. They must be of the form <code>YYYYMMDD, series1, series2, </code>… . And if you set the <code>errorBars</code> property, make sure you alternate data series and standard deviations.</li>
+ <li>dygraphs are not happy when placed inside a <code><center></code> tag. This applies to the CSS <code>text-align</code> property as well. If you want to center a Dygraph, put it inside a table with <code>align = center</code> set.</li>
+ <li>Don't set the <code>dateWindow</code> property to a date. It expects milliseconds since epoch, which can be obtained from a JavaScript Date object's valueOf method.</li>
+ <li>Make sure you don't have any trailing commas in your call to the Dygraph constructor or in the options parameter. Firefox, Chrome and Safari ignore these but they can cause a graph to not display in Internet Explorer.</li>
+ </ul>
+
+ <h2 id="policy">Data Policy</h2>
+ <p>dygraphs is purely client-side JavaScript. It does not send your data to any servers – the data is processed entirely in the client's browser.</p>
+
+ <p style="font-size:0.8em">Created May 9, 2008 by <a href=mailto:danvdk@gmail.com>Dan Vanderkam</a></p>
+ </div>
+
+
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