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.
The leaves initially start to change as days become shorter and nights longer. The lack of sunlight causes trees and plants to block materials like carbohydrates and chlorophyll from reaching the leaves. This process reveals colors that have actually been in the leaves all summer long.