Quotulatiousness

June 22, 2015

Breaking – it’s a nation-wide crime wave (when you cherry-pick your data)

Filed under: Law, USA — Tags: , , — Nicholas @ 04:00

Daniel Bier looks at how Wall Street Journal contributor Heather Mac Donald concocted her data to prove that there’s a rising tide of crime across the United States:

Heather Mac Donald is back in the Wall Street Journal to defend her thesis that there is a huge national crime wave and that protesters and police reformers are to blame.

In her original piece, Mac Donald cherry picked whatever cities and whatever categories of crime showed an increase so far this year, stacked up all the statistics that supported her idea, ignored all the ones that didn’t, and concluded we are suffering a “nationwide crime wave.”

Of course, you could do this kind of thing any year to claim that crime is rising. But it isn’t.

The fifteen largest cities have seen a 2% net decrease in murder so far this year. Eight saw a rise in murder rates, and seven saw an even larger decline.

Guess which cities Mac Donald mentioned and which she did not.

This is how you play tennis without the net. Or lines.

And in her recent post, buried seven paragraphs in, comes this admission: “It is true that violent crime has not skyrocketed in every American city — but my article didn’t say it had.”

But neither did her article acknowledge that murder in big cities was falling overall — in fact, it didn’t acknowledge that murder or violent crime was declining anywhere. Apparently, in her view, it is acceptable to present a distorted view of the data as long as it isn’t an outright lie.

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