Don't know and it does not matter. I had to take 4 levels of stat in college to get my degree. Loved it, frankly. One of the basic principles is the quality and relevance of the "sample". For example, if you wanted to know how the population of the world felt about green beans, you could not possibly ask everybody, so you would determine what a relevant sample would be and use it to predict the opinion of the total population. You would NOT ask 100 people.
They have been keeping records on weather for what, 100+ years? I don't think they have a big enough sample to adequately predict anything or make statements like they are. While I am sure that archeology to some extent can help them expand their sample, a lot of that is going to be guess work.
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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