The Correlation. Correlation is a measue of how close the line fits the points that you found in your experiment. Anyone can say whether they think the line is a good fit or not, but to measure it exactly, we use the correlation coefficient: R2.
As the seasons change and the amount of sunlight decreases, less chlorophyll is produced, and the leaves appear less green. Chlorophyll is broken down into simpler compounds at a constant rate, so green leaf color will gradually fade as chlorophyll production slows or stops.
And there have been times when some trees change colors in October, then a few weeks later we have a 2nd change of colors in the very same area. That happened a couple of years ago here in Knoxville. It was strange but fun, too. 08-13-2009, 08:58 AM.