A few days ago @1wheel made a nice version of the chart that also shows the individual temperatures as points + linear trend lines
bl.ocks.org/1wheel/89ec11ab72a

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And today I forked Adams chart to use Loess regression instead of the linear model, because I thought temperature isn't increasing linearly (but maybe exponentially?)

bl.ocks.org/gka/1d716deada5f05

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the result is sort of interesting. for some months, like July and August the temp. increase really has picked up the pace in the late 1960s. But for October the increases seem to be a lot more "linear". Might be just some Loess artifacts.

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@gka I generally like LOESS, any "methodology" for picking the smoothing etc. parameters? Was it chosen to give a visually smooth yet non-linear result? Also, wondering if curves would differ if the month beginnings and ends were augmented by a few adjacent data points from the prior and subsequent months for continuity

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@monfera the "methodology" is starting with bandwidth/smoothing of zero (full noise) and gradually increasing it while observing the patterns that emerge. it's really useful as interactive method, as the parameter depends on the data. At least this is what Cleveland suggested in his LOESS paper in 1979: pdfs.semanticscholar.org/414e/

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