ruge                  package:VGAM                  R Documentation

_R_u_t_h_e_r_f_o_r_d-_G_e_i_g_e_r _P_o_l_o_n_i_u_m _D_a_t_a

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

     Decay counts of polonium  recorded by Rutherford and Geiger
     (1910).

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

     data(ruge)

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

     This data frame contains the following columns:

     _c_o_u_n_t_s a numeric vector, counts or frequencies

     _n_u_m_b_e_r a numeric vector, the number of decays

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

     These are the radioactive decay counts of polonium recorded by
     Rutherford and Geiger (1910) representing the number of
     scintillations in 2608 1/8 minute intervals.  For example, there
     were 57 frequencies of zero counts. The counts can be thought of
     as being approximately Poisson distributed.

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

     Rutherford, E. and Geiger, H. (1910) The Probability Variations in
     the Distribution of alpha Particles, _Philosophical Magazine_,
     *20*, 698-704.

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

     data(ruge)
     attach(ruge)
     lambdahat = weighted.mean(number, w=counts)
     (N = sum(counts))
     cbind(number, counts, fitted=round(N * dpois(number, lam=lambdahat)))
     detach(ruge)

