Standard deviation and variance are two basic mathematical concepts that have an important place in various parts of the financial sector, from accounting to economics to investing. Both measure the ...

Most people have decades of experience looking at graphs. We see them in television reports, books, magazines, presentations at work, and on the stock market apps on our phones. On the surface, ...

In response to my article, Is the Stock Market Too Concentrated?, which relied upon standard-deviation calculations to assess investment risk, a reader wrote: “My problem [with your argument] is ...

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