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192 lines
6.6 KiB
HTML
192 lines
6.6 KiB
HTML
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<meta http-equiv="content-type" content="text/html; charset=utf-8">
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<title>Bar Graphs</title>
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<script>reSpell=[["favorite","favourite"]];</script>
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<meta name="description" content="A Bar Graph (also called Bar Chart) is a graphical display of data using bars of different heights" />
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<h1 align="center">Bar Graphs</h1>
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<div class="def">
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<p>A <b>Bar Graph</b> (also called Bar Chart) is a graphical display of data using bars of different heights.
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</p>
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</div>
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<p>Imagine you just did a survey of your friends to find which kind of movie they liked best:</p>
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<div class="simple">
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<table align="center">
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<tr align="center">
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<td colspan="5"><b>
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<em>Table:</em>
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<em> Favorite Type of Movie</em>
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</b></td>
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</tr>
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<tr align="center">
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<th width="80">Comedy</th>
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<th width="80">Action</th>
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<th width="80">Romance</th>
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<th width="80">Drama</th>
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<th width="80">SciFi</th>
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</tr>
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<tr align="center">
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<td>4</td>
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<td>5</td>
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<td>6</td>
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<td>1</td>
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<td>4</td>
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</tr>
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</table>
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</div>
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<p>We can show that on a bar graph like this:</p>
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<p align="center"><img src="images/bar-chart-movies.svg" alt="Favorite Type of Movie" /></p>
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<p>It is a really good way to show relative sizes: we can see which types of movie are most liked, and which are least liked, at a glance.</p>
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<p>We can use bar graphs to show the relative sizes of many things, such as what type of car people have, how many customers a shop has on different days and so on.</p>
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<div class="example">
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<h3>Example: Nicest Fruit</h3>
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<p>A survey of 145 people asked them "Which is the nicest fruit?":</p>
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<div class="simple">
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<table border="0" align="center" cellspacing="5">
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<tr align="center">
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<td>Fruit:</td>
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<td><b>Apple</b></td>
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<td><b>Orange</b></td>
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<td><b>Banana</b></td>
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<td><b>Kiwifruit</b></td>
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<td><b>Blueberry</b></td>
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<td><b>Grapes</b></td>
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</tr>
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<tr align="center">
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<td>People:</td>
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<td>35</td>
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<td>30</td>
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<td>10</td>
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<td>25</td>
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<td>40</td>
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<td>5</td>
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</tr>
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</table>
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</div>
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<p>And here is the bar graph:</p>
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<p class="center"><img src="images/bar-graph-fruit.svg" alt="bar graph for fruit" /></p>
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<p> That group of people think Blueberries are the nicest. </p>
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<p>Bar Graphs can also be <b>Horizontal</b>, like this:</p>
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<p class="center"><img src="images/bar-graph-horiz.svg" alt="bar graph horizontal" /></p>
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</div>
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<div class="example">
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<h3>Example: Student Grades</h3>
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<p>In a recent test, this many students got these grades:</p>
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<table width="50%" border="0" align="center">
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<tr align="center">
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<td width="25%">Grade:</td>
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<td width="15%"><b>A</b></td>
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<td width="15%"><b>B</b></td>
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<td width="15%"><b>C</b></td>
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<td width="15%"><b>D</b></td>
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</tr>
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<tr align="center">
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<td width="25%">Students:</td>
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<td>4</td>
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<td>12</td>
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<td>10</td>
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<td>2</td>
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</tr>
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</table>
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<p>And here is the bar graph:</p>
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<p align="center"><img src="images/bar-chart-example.svg" alt="Bar Chart Example" /></p>
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</div>
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<p>You can create graphs like that using our <a href="data-graph.html">Data Graphs (Bar, Line, Dot, Pie, Histogram)</a> page.</p>
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<p> </p>
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<h2>Histograms vs Bar Graphs</h2>
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<p style="float:right; margin: 0 0 5px 10px;"><img src="images/bar-chart-vs-histogram.svg" alt="bar chart vs histogram" /></p>
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<p>Bar Graphs are good when your data is in <b>categories</b> (such as "Comedy", "Drama", etc).</p>
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<p>But when you have <a href="data-discrete-continuous.html">continuous data</a><b> </b>(such as a person's height) then use a <a href="histograms.html">Histogram</a>.</p>
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<p>It is best to leave gaps between the bars of a Bar Graph, so it doesn't look like a Histogram. </p>
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<p> </p>
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<div class="questions">
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<script type="text/javascript">getQ(678, 679, 1424, 1425, 1429, 2149, 2150, 3765, 3766, 3767);</script>
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</div>
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<div class="related">
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<a href="data-graph.html">Make a Bar Graph</a>
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<a href="line-graphs.html">Line Graphs</a>
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<a href="pie-charts.html">Pie Charts</a>
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<a href="pictographs.html">Pictographs</a>
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<a href="histograms.html">Histograms</a>
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<a href="index.html">Data Index</a>
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</div>
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