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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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