Elaborazione Dati Naturalistici
Sample Data folder (poplar = pioppo)
Clones are genetically identical cells descended from the same individual. Researchers have identified a single poplar clone that yields fast-growing, hardy trees. These trees may one day serve as an alternative to conventional fuel as an energy resource.
Researchers at The Pennsylvania State University planted Poplar Clone 252 on two different sites--one, a rich site by a creek, and the other, a dry, sandy site on a ridge. They measured the diameter in centimeters, height in meters, and the dry weight of wood in kilograms for a sample of three-year-old trees so that they could determine the weight of a tree from its diameter and height measurements.
In an effort to determine how to maximize yield, the researchers designed an experiment to determine how two factors, Site and Treatment, influence the weight of four-year-old poplar clones. They applied four different treatments to the trees in Site 1 (the rich, moist soil by a creek) and Site 2 (the dry, sandy soil on a ridge). Treatment 1 was the control (no treatment), Treatment 2 was fertilizer, Treatment 3 was irrigation, and Treatment 4 was both fertilizer and irrigation. To account for a variety in weather conditions, they replicated the data by planting half the trees in Year 1 and the other half in Year 2.
Column Name Description
C1 Site Site:
1 = rich, moist soil near a creek 2 = dry, sandy soil on a ridge
C2 Year First or second year
C3 Treatmnt Treatment:
1 = none 2 = fertilizer 3 = irrigation
4 = fertilizer and irrigation
C4 Diameter Diameter of tree in cm
C5 Height Height of tree in meters
C6 Weight Dry weight of wood in kilograms
C7 Age Age of tree in years
