WEBVTT

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Choose a probability, tau, and invert the
fitted conditional distribution.

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The result is the GDP value where that
distribution reaches tau.

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Here, one npqreg() call directly traces
the 25th, 50th, and 75th conditional

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quantiles across Italy's ordered years.

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The curves show the lower, middle,
and upper parts of the distribution.

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The full script is on Gallery Video Demos.