Dataset: carspeed.csv Source: H. Ding, X. Zhao, J. Rong, J. Ma (2013). "Experimental Research on the Effectiveness of Speed Reduction Markings Based on Driving Simulation: A Case Study," Accident Analysis and Prevention, Vol. 60, pp. 211-218. Description: Randomized Block Design, with 3 treatments of speed redumction markings (None, Longitudinal Traverse) in 15 subjects. Response is average acceleration (m/sec^2) Variables Trt (1=None, 2=Longitudinal, 3=Traverse) Subject accelerate