POTD: Moonrise Over Normal

POTD: Moonrise over NormalMoonrise Over Normal Bozeman, Montana 2014

The blizzard we had the other day formed this interesting snowdrift on the fence behind our neighbor’s satellite dish. Being the statistician that I am, it reminded me immediately of a normal probability distribution (a.k.a. Gaussian distribution or the proverbial “bell-shaped” curve). On closer inspection though, it’s not as symmetrical as it first looked. It’s actually skewed to the right, which would make it a better candidate for a log-normal distribution. (Not that anyone cares about that last point–I just added it to head off the couple of people I thought might actually call me on that point.)]]>

4 thoughts on “POTD: Moonrise Over Normal”

  1. Looks like a slightly dark histogram to me…not ETTR! And isn’t is skewed to the Left, not the right? 😉

    1. Kathy, as a statistician I’m probably one of the few photographers who took immediately to the histograms on digital camera screens. Skewness doesn’t relate to where the bulk of the data lie, as you’re probably thinking. Rather it is a measure of the asymmetry of the distribution around it’s mean, if it extends further to the high end, often described as having a “fatter tail” on that end, then it’s skewed right. If the tail is fatter on the low end, then it’s skewed left. Of course, viewed from the other side of the fence, this distribution would be skewed left.

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