(This article was originally published at Effective Graphs, and syndicated at StatsBlogs.)

Sarah Kliff wrote a blog post including the length of Republican and Democratic National Convention remarks as prepared for delivery and as actually delivered. The problem is that she used misleading graphs: bar charts that don’t include zero. Here are two of her graphs:

Any length begins at zero so the impression one gets by comparing truncated lengths is false. In this example it appears that President Clinton’s speech was more than three times as long as that of Michelle Obama’s while in fact it was less than twice as long.

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