estShannon               package:MCPAN               R Documentation

_E_s_t_i_m_a_t_e _t_h_e _S_h_a_n_n_o_n _I_n_d_e_x

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

     Calculates estimates of the Shannon-Wiener from count data.

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

     estShannon(x, Nspec = NULL)

_A_r_g_u_m_e_n_t_s:

       x: a integer(numeric) vector of species counts 

   Nspec: a single integer value, fixing the number of species to a
          certain value 

_V_a_l_u_e:

     A list, containing the elements: 

estimate : a single numeric value, the estimate with bias correction
          according to Fritsch and Hsu (1999)

 estraw : a single numeric value, the raw estimate 

 varest : a single numeric value, the variance estimate according to
          Fritsch and Hsu (1999) 

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

     Fritsch, KS, and Hsu, JC (1999): Multiple Comparison of Entropies
     with Application to Dinosaur Biodiversity. Biometrics 55,
     1300-1305.

_S_e_e _A_l_s_o:

     estSimpsonf for estimating Shannon indices pooled over several
     samples, grouped by a factor

