Sentences with phrase «sign error»

A "sign error" refers to a mistake made while using positive (+) and negative (-) signs in a calculation or equation. It happens when you accidentally use the wrong sign, resulting in a wrong answer. Full definition
(At the position recorded by Messier, which also found its way into John Herschel's GC as GC 1594 and, consequently, into Dreyer's NGC as NGC 2478, no cluster is found, so that this object was missed, until T.F. Morris, in 1959, identified it correctly as Herschel's cluster H VIII.38 (NGC 2422), and realised that Messier had done a simple sign error in RA difference when reducing the positional data.)
Michael, I believe you have a minus sign error in one of your equations, reproduced below.
Now in fairness to Spencer, he is only responsible for a combination of algebraic and sign errors that led him to a cooling trend from satellite data that correctly analyzed, actually indicated warming.
Roy Spencer, best known for his satellite work arguing against warming of the atmosphere (which turns out to have been an artifact of a combination of algebraic and sign errors), criticizes Gore for pointing out that recent warmth appears to be anomalous in at least the past 1000 years.
Subsequent studies by other groups have borne out the reliability of Fu et al.'s trend estimates and they have shown that the algorithm used in prior estimates had a sign error which led to spuriously small trends.
E.g. Google «Mears pointing out a sign error in C+S's dataset»
[Response: To clarify, the «personal communication» from RSS to S+C concerned a sign error in how the diurnal drift correction had been applied in the S+C 2LT product.
It appears to have been a sign error.
As we continue on working through the appendix, B6 has a sign error in the 2nd term on the right hand side, which is fixed by B7.
And, to this day, UAH's Roy Spencer and John Christy have not released their code as far as I know (Mears and Wentz found the sign error in the UAH diurnal adjustment by emulating the steps).
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