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Probit Analysis: Down Goes the Meathouse!

Everything has its breaking point

Patrick Runkel
Mon, 12/03/2012 - 13:26
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Whenever something suddenly fell apart, my grandfather used to exclaim, “Down goes the meathouse!” I don’t know where that expression came from—as a child I often pictured a flabby house of raw meat caving in on itself. This was decades before Lady Gaga made wearing raw meat dresses... uh... fashionable?

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My grandfather’s expression still pops into my head when I think about a probit analysis. A probit study is based on one very simple premise: Everything has its breaking point.

To illustrate this study, and to relive my childhood, I built some good old-fashioned card houses and tested how their roofs held up to stress loads of up to 50 U.S. quarters.

At each stress load, I tested 10 card houses and recorded how many collapsed. Here are the results, recorded in a Minitab worksheet:

Pretty simple, huh? The key thing to remember for this analysis is that the response variable is binary: The item fails (in this case, collapses), or it does not fail.

 …

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