mcycle package:MASS R Documentation _D_a_t_a _f_r_o_m _a _S_i_m_u_l_a_t_e_d _M_o_t_o_r_c_y_c_l_e _A_c_c_i_d_e_n_t _D_e_s_c_r_i_p_t_i_o_n: A data frame giving a series of measurements of head acceleration in a simulated motorcycle accident, used to test crash helmets. _U_s_a_g_e: mcycle _F_o_r_m_a_t: '_t_i_m_e_s' in milliseconds after impact. '_a_c_c_e_l' in g. _S_o_u_r_c_e: Silverman, B. W. (1985) Some aspects of the spline smoothing approach to non-parametric curve fitting. _Journal of the Royal Statistical Society series B_ *47*, 1-52. _R_e_f_e_r_e_n_c_e_s: Venables, W. N. and Ripley, B. D. (1999) _Modern Applied Statistics with S-PLUS._ Third Edition. Springer.