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On Jan 8, 9:54*am, John H. wrote:
On Tue, 8 Jan 2008 06:13:17 -0800 (PST), wrote: snipped Loogy, you said it all right below: An average is an average. We all agree with that statement. The question revolves about the title you give your average. Apparently that's a point you're not grasping well. If I take the average of the noon temperature in Seattle (50F)and the 3:00 PM temperature in Washington, DC (64F}, I can then say the average of the two temperatures at the same time was 57F. If I wanted to be bold, I could say that the average temperature across the continental US was 57F. Hopefully, we can both see the stupidity of that 'boldness'. -- John H "All decisions are the result of binary thinking." It is what it is. An average. Given enough data sets it gets quite accurate. There are a lot of things in engineering that were derived by nothing more than averaging. Case in point. We know that a given shape of steel, let's say a wide flange shape, with a certain value for Bf, and a certain value for d and a certain value for k and a certain value for Tw will fail with a point load of X. How do we know this? By making them fail. Does every piece of a certain size wide flange shape break at exactly the same load? Not by a long shot. Want to guess how we came up with X? Yep, averaging. |
#2
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#4
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On Tue, 8 Jan 2008 13:07:31 -0800, "Calif Bill"
wrote: "John H." wrote in message .. . On Tue, 8 Jan 2008 10:46:31 -0800 (PST), wrote: On Jan 8, 9:54 am, John H. wrote: On Tue, 8 Jan 2008 06:13:17 -0800 (PST), wrote: snipped Loogy, you said it all right below: An average is an average. We all agree with that statement. The question revolves about the title you give your average. Apparently that's a point you're not grasping well. If I take the average of the noon temperature in Seattle (50F)and the 3:00 PM temperature in Washington, DC (64F}, I can then say the average of the two temperatures at the same time was 57F. If I wanted to be bold, I could say that the average temperature across the continental US was 57F. Hopefully, we can both see the stupidity of that 'boldness'. -- John H "All decisions are the result of binary thinking." It is what it is. An average. Given enough data sets it gets quite accurate. Again, the line above says it all. There have to be 'enough' data sets, read at the same times, not influenced by man-made structures, etc, etc, in order to say that the 'average temperature of the earth' is doing anything. If you said, "The average temperature of these 1279 thermometers read at 1200 hrs, GMT was X," then you'd get no argument. You could make all the claims you wanted about the 'average temperature of the 1279'! -- John H "All decisions are the result of binary thinking." Both wrong. You only need ONE data set. But it needs to be a huge data set. And do you read all the data points at a single time. Or do your read all the data points at Noon locally or some other local time point? OR do you read all the data points at the same relative time. Divide the world in 24 time zones as now? Or into 360 time zones on each degree of the circumference? As Tom the mathematician says there are lots of different ways to average. Did I say something different? -- John H "All decisions are the result of binary thinking." |
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