Per request, I’ve tested the model of global temperature with el Niño, volcanic aerosols, and solar variations. It was suggested using a 15-year time span as a “hold-out” period for validation, but I decided to use longer hold-out period. Hence the model was fit with data from 1951 through 1989, and the period from 1990 to the present to investigate whether or not the model could match data with which it was not trained. I also decided to do this test with the NASA GISS data set.
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