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.
Although not fully understood, several factors affect when and how leaves change color and the hues they produce. These factors include: 1  Shortening of day length. 2  Cooling temperatures. 3  organic pigments in the leaf cells. 4  sunlight intensity. 5  moisture. 6  tree genetic traits. 7  site characteristics. 8  latitude.