zelazo                 package:ISwR                 R Documentation

_A_g_e _a_t _w_a_l_k_i_n_g

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

     The 'zelazo' object is a list with four components.

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

     data(zelazo)

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

     This is a list containing data on age at walking (in months) for
     four groups of infants: 

     _a_c_t_i_v_e test group receiving active training. These children had
          their walking and placing reflexes trained during four
          three-minute sessions that took place every day from their
          second to their eighth week of life.

     _p_a_s_s_i_v_e passive training group. Received the same types of social
          and gross motor stimulation,  but did not have their specific
          walking and placing reflexes trained. 

     _n_o_n_e no training.  Had no special training, but were tested along
          with the children who underwent active or passive training.

     _c_t_r._8_w eigth-week controls. Had no training and were only tested
          at the age of 8 weeks. 

_N_o_t_e:

     When asked to enter these data from a text source, many students
     will use one vector per group and will need to reformat data into
     a data frame for some uses. The rather unusual format of this data
     set mimics that situation.

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

     P.R.~Zelazo, N.A.~Zelazo, and S.~Kolb (1972), ``Walking'' in the
     newborn, _Science_, 176, 314-315.

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

     data(zelazo)

