Dataset:  shotgun_spread1.csv

Source: C.H. Fann, W.A. Ritter, R.H. Watts, and W.F. Rowe (1986).
"Regression Analysis Applied to Shotgun Range-of-Fire Estimations:
Results of a Blind Study," Journal of Forensic Sciences," Vol. 31, #3,
pp. 840-854.

Description: Results of experiments measuring spread of shotgun pellets
from distances of 10-50 feet for two cartridge types (1=Federal 00
buckshot cartridges, Lot No. 2127, 2=Peters No. 9 shot cartridges, Lot
No. LBU 06H506). Response is the square rro to area of the smallest rectangle
enclosing pellet pattern.

Variable names
cartType
rangeFire   (feet)
rootA       (response)
grpMean     (mean of 6 shots for that cartridge type and distance)
grpVar      (variance of 6 shots for that cartridge type and distance)
grpSD       (SD of 6 shots for that cartridge type and distance)