galaxy             package:ElemStatLearn             R Documentation

_G_a_l_a_x_y _D_a_t_a

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

     Radial Velocity of Galaxy NGC7531

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

     data(galaxy)

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

     A data frame with 323 observations on the following 5 variables.

     _e_a_s_t._w_e_s_t the east-west coordinate.  The origin,  (0,0),  is near 
          the  center of the galaxy, east is negative, west is
          positive.

     _n_o_r_t_h._s_o_u_t_h the north-south coordinate.  The origin, (0,0), is
          near the center of the galaxy, south is negative, north is
          positive.

     _a_n_g_l_e degrees of counter-clockwise rotation from the horizon- tal
          of the slot within which the observation lies.

     _r_a_d_i_a_l._p_o_s_i_t_i_o_n signed  distance  from  origin;  negative  if
          east-west coordinate is negative.

     _v_e_l_o_c_i_t_y radial velocity measured in km/sec.

_D_e_t_a_i_l_s:

     The galaxy data frame records the  radial  velocity  of  a spiral 
     galaxy  measured  at 323 points in the area of sky which it
     covers.  All the measurements  lie  within  seven slots  crossing
     at the origin.  The positions of the meas- urements given by four
     variables (columns).

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

     Buta, R. (1987)  The  Structure  and  Dynamics  of  Ringed
     Galaxies,  III:  Surface  Photometry and Kinematics of the Ringed
     Nonbarred Spiral NGC7531.    The  Astrophysical  J. Supplement
     Ser. Vol. 64, pp. 1-37.

     John M. Chambers and Trevor J. Hastie, (eds.)  Statistical Models
     in S, Wadsworth and Brooks, Pacific Grove, CA 1992, pg. 352.

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

     str(galaxy) 
     summary(galaxy)

