SPDATA            package:PresenceAbsence            R Documentation

_S_p_e_c_i_e_s _P_r_e_s_e_n_c_e/_A_b_s_e_n_c_e _D_a_t_a

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

     This data set has Presence/Absence predictions for 13 species at
     386 forested locations. It consists of species, observed
     presence-absence values, and the probability predictions of three
     different models.

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

     data(SPDATA)

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

     A data frame with 386 observations for 13 species with the
     following 5 variables.

     '_S_P_E_C_I_E_S' a character vector of species codes

     '_O_B_S_E_R_V_E_D' a numeric vector of 0-1 values

     '_G_A_M' a numeric vector of predicted probabilities

     '_S_e_e_5' a numeric vector of predicted probabilities 

     '_S_G_B' a numeric vector of predicted probabilities 

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

     This dataset is from:

     Moisen, G.G., Freeman, E.A., Blackard, J.A., Frescino, T.S.,
     Zimmerman N.E., Edwards, T.C. Predicting tree species presence and
     basal area in Utah: A comparison of stochastic gradient boosting,
     generalized additive models, and tree-based methods. Ecological
     Modellng, 199 (2006) 176-187.

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

     data(SPDATA)

