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Purple platypus in spanish9/27/2023 ![]() The frequency distribution (shown by the gray bars) doesn’t follow a normal distribution (shown by the dotted green curve). There are 400 students at the school, ranging in age from 14 to 18 years old: Platykurtic distribution exampleĪ sociologist is studying the social media use of students at a small high school. Statisticians now understand that kurtosis is a measure of tailedness, not “peakedness.”Ī trick to remember the meaning of “platykurtic” is to think of a platypus with a thin tail. ![]() Although many platykurtic distributions have a flattened peak, some platykurtic distributions have a pointy peak. NoteThe “platy” in “platykurtosis” comes from the Greek word platús, which means flat. Platykurtosis is sometimes called negative kurtosis, since the excess kurtosis is negative. In other words, platykurtic distributions have: Platykurtic distributions have less kurtosis than a normal distribution. Occasionally, a female baby elephant will be born weighing less than 180 or more than 240 lbs.ĭiscover proofreading & editing What is a platykurtic distribution?Ī platykurtic distribution is thin-tailed, meaning that outliers are infrequent. Mesokurtic distributions have outliers that are neither highly frequent, nor highly infrequent, and this is true of the elephant birth weights. If a sample has a kurtosis of approximately 3, you can assume it’s drawn from a mesokurtic population. NoteAlthough a population’s probability distribution can have a kurtosis of exactly 3, real data is almost always at least slightly platykurtic or leptokurtic. She finds that the kurtosis is 3.09 and the excess kurtosis is 0.09, and she concludes that the distribution is mesokurtic. The zoologist calculates the kurtosis of the sample. She collects birth weight data for 400 female baby elephants:įrom the graph, we can see that the frequency distribution (shown by the gray bars) approximately follows a normal distribution (shown by the green curve). Suppose that a zoologist is interested in the distribution of elephant birth weights, so she contacts zoos and sanctuaries around the world and asks them to share their data. On average, a female baby elephant weighs an impressive 210 lbs at birth. Normal distributions have an excess kurtosis of 0, so any distribution with an excess kurtosis of approximately 0 is mesokurtic.Since normal distributions have a kurtosis of 3, excess kurtosis makes comparing a distribution’s kurtosis to a normal distribution even easier: Often, kurtosis is described in terms of excess kurtosis, which is kurtosis − 3. Normal distributions have a kurtosis of 3, so any distribution with a kurtosis of approximately 3 is mesokurtic.Kurtosis is measured in comparison to normal distributions. Frequently asked questions about kurtosisĭistributions can be categorized into three groups based on their kurtosis:Ī mesokurtic distribution is medium-tailed, so outliers are neither highly frequent, nor highly infrequent.These examples are programmatically compiled from various online sources to illustrate current usage of the word 'platypus.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Reuters, NBC News, The researchers lastly considered how these pharmaceuticals might affect two predators in their Australian stream ecosystems: the non-native brown trout and the native Australian platypus. 2011 The relocation comes at a time when the platypus is increasingly threatened by habitat destruction, river degradation, feral predators, and extreme weather events such as droughts and bushfires. Carl Zimmer, Discover Magazine, 12 Dec. 2023 And then European explorers encountered the platypus, a mammal that laid eggs. Tim Flannery, The New York Review of Books, 2 Feb. Reuters, NBC News, The platypus spur is almost an inch long and wickedly pointed and curved, resembling a much-thickened rattlesnake fang. Lauren Dana Ellman, Travel + Leisure, 1 July 2023 Each platypus will be tracked for the next two years to better understand how to intervene and relocate the species in the event of drought, bushfire, or flood, researchers said. 2022 Visitors can spot magnificent wildlife here, including its namesake kangaroo, plus koalas, seals, and platypus, to name a few. Sarah Kuta, Smithsonian Magazine, Meanwhile, Qatar, Turkey, and half of Libya have banded together out of mutual sympathy for the Muslim Brotherhood-a bizarre platypus of a military alliance with little to strategically bind them. Recent Examples on the Web Biologists collected the platypuses from various populations in southeastern New South Wales to help ensure genetic diversity.
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