Mandible               package:lmtest               R Documentation

_M_a_n_d_i_b_l_e _D_a_t_a

_D_e_s_c_r_i_p_t_i_o_n:

     Mandible Data.

_U_s_a_g_e:

     data(Mandible)

_F_o_r_m_a_t:

     Data from 167 fetuses, especially:

     _a_g_e gestational age in weeks.

     _l_e_n_g_t_h mandible length in mm.

_S_o_u_r_c_e:

     The data was originally published by Chitty et al., 1993, and
     analysed in Royston and Altman, 1994 (the data is given there).
     Only measurments with 'age <= 28' were used in this analysis.

_R_e_f_e_r_e_n_c_e_s:

     L. S. Chitty and S. Campbell and D. G. Altman (1993),  Measurement
     of the fetal mandible - feasibility and construction of a centile
     chart., _Prenatal Diagnosis_,  *13*, 749-756.

     P. Royston and D. G. Altman (1994), Regression Using  Fractional
     Polynomials of Continuous Covariates: Parsimonious  Parametric
     Modelling. _Applied Statistics_, *43*, 429-453.

_E_x_a_m_p_l_e_s:

     data(Mandible)
     lm(length ~ age, data=Mandible, subset=(age <= 28))

