stamp               package:bootstrap               R Documentation

_D_a_t_a _o_n _T_h_i_c_k_n_e_s_s _o_f _S_t_a_m_p_s

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

     Thickness in millimeters of 485 postal stamps, printed in 1872.
     The stamp  issue of that year was thought to be a "philatelic
     mixture",  that is, printed  on more than one type of paper. It is
     of historical interest to determine how many different types of
     paper were used.

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

     data(stamp)

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

     A data frame with 485 observations on the following variable.

     _T_h_i_c_k_n_e_s_s Thickness in millimeters, a numeric vector

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

     In the book, this is used to exemplify determination of number of
     modes.  It is also used for kernel density estimation.

_N_o_t_e:

     The main example in the book is on page 227. See also the  CRAN
     package diptest for an alternative method.

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

     Efron, B. and Tibshirani, R. (1993) An Introduction to the
     Bootstrap.  Chapman and Hall, New York, London.

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

     summary(stamp)
     with(stamp, {hist(Thickness);
                  plot(density(Thickness), add=TRUE)})

