Soren wrote on Jan 14
th, 2010 at 9:00pm:
Both are about 'the effects of something changing by n %'. Both are about the reliability of n as the measure of effect of change.
You declare n=6 as "extremely difficult" yet boldly go ahead, and in Mozz's words, are happy to make 'educated quesses' if n = 0.0284.
The point is that it's x=6 and y= 0.0384 or whatever.
Quote:Secondly, the contexts - oceans and atmosphere - are not as wildly different in magnitude and complexity as your silly banana and rat examples. These new ones are as relevant as your earlier example about inhailing/imbibing poison directly. Only Mozz bought that one and he may well be the only one taken in by these ones.
If you can't grasp this simple point then there is no point trying to convince you of anything more complex. This argument is not even related to global warming. It's related to the precision of two totally different measurements that are chalk and cheese.
In the first case, the factors that determine the precision are the calbration of the flow meters, the accuracy of determination of the position of the ship, the extent to which the dynamics of oceanic flow change over the measurement period and so on... In short, it's a difficult measurement.
In the second case, the factors that determine the accuracy are the accuracy of the calibration standards, the accuracy of the GC and lack of contamination of the sample and the extent to which it is representative. Carbon dioxide mixing in the atmosphere is relatively fast, and there is very little difference, even in readings between stations situated in different hemispheres. Currently the atmospheric CO2 at Mauna Loa is 387ppm. Seasonally corrected, it's 388ppm. The Global Mean is also 388ppm. At the South Pole, it's 388ppm, at Christmas Island, it's just over 387ppm, at Baring Head NZ, it's also 387ppm. These are independent measurements and they are relatively easy to conduct. I have not used a Gas Chromatograph for at least 15 years, but I am quite confident that I could take a representative air sample, go to our lab and test a sample using a GC, and get a result to within 1% at least.
The two measurements are like chalk and cheese. If you make a statement on the precision and accuracy of one method, it has absolutely no bearing on the other. It astounds me that you think differently.
The comparative example of rat rectal temperature determination and IQ determination are also chalk and cheese. The first one is easy. The second one depends on the degree to which his self styled Lordship has self medicated using single malt.
You simply cannot deduce something about accuracy and precision of one method from an entirely unrelated one.
OK. You have embarrassed yourself enough. Please know where to quit.