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Politics : Formerly About Advanced Micro Devices

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To: Thomas A Watson who wrote (999321)	2/7/2017 11:43:37 AM
From: Wharf Rat	Read Replies (1) of 1577580

Yeah, about this graph? Rose’s article presents a deeply misleading graph where he shows an arbitrary offset between NOAA’s data and the Hadley land/ocean dataset. This is an artifact of the use of different baselines; Hadley’s “0C” value is relative to the average temperature from 1961-1990, while NOAA’s is relative to the average temperature from 1901-2000 (a period which includes the colder early 20th century) This comparison ends up being spurious, because each record uses a different baseline period to define their temperature anomaly. As the chart below shows, when you correctly put the two datasets on the same baseline (eg, with respect to the 1961-1990 period), you find no offset in recent years between the two, though there is slightly more warming in the NOAA dataset due to the higher weight they give more reliable buoy data in their analysis. Message 30971000

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