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And negative skewness is the opposite: it’s a small chance of something terrible happening such as a bank run.

Plotting the global distribution of skewness in records of scientists’ citations by others ought to produce a symmetrical curve, says Wren, but doesn’t.

For example, why do so many climate models fail to simulate the nonlinear processes associated with the SST skewness?

That step alone would reduce the skewness of the nation’s post-tax income distribution.

The first is to respond to skewness towards large values; i.e., cases in which one or a few points are much larger than the bulk of the data.