Nematocera              package:BSagri              R Documentation

_E_k_l_e_k_t_o_r _c_o_u_n_t_s _o_f _N_e_m_a_t_o_c_e_r_a

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

     In a field trial, 4 treatments (A,B, Standard, Novum) were
     arranged in a randomized complete block design with 8 blocks and
     32 plots. In summer 2005 soil eklektor traps were placed in each
     plot, on six dates from 2005-07-12 to 2005-09-25, the number of
     individuals of Nematocera (gnats, midges and others) hatching from
     soil were counted. The individuals were classified to the family
     level. Interest was in assessing potential effects of a novel
     agricultural practice (Novum) on the abundance of Nematocera.

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

     data(Nematocera)

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

     A data frame with 192 observations on the following 14 variables.

     '_D_a_t_e' a POSIXt, the time of counting the individuals in the
          eklektor trap

     '_T_r_e_a_t_m_e_n_t' a factor with 4 levels, 'A', 'B', 'Standard' and
          'Novum', where 'Novum' is the novel treatment, 'Standard' is
          the standard treatment most similar to 'Novum', and 'A' and
          'B' are additional standard treatments.

     '_B_l_o_c_k' a numeric vector, specifying the blocks 1-8

     '_P_l_o_t' a factor with 32 levels 'A1' to 'Standard8', indicator
          variables for the individual eklektors

     '_B_i_b_i_o' a numeric vector, counts of individuals, belonging to the
          family

     '_C_e_c_i_d_o' a numeric vector, counts of individuals, belonging to the
          family

     '_C_e_r_a_t_o' a numeric vector, counts of individuals, belonging to the
          family

     '_C_h_i_r_o' a numeric vector, counts of individuals, belonging to the
          family

     '_M_y_c_e_t_o' a numeric vector, counts of individuals, belonging to the
          family

     '_P_s_y_c_h_o' a numeric vector, counts of individuals, belonging to the
          family

     '_S_c_a_t_o' a numeric vector, counts of individuals, belonging to the
          family

     '_S_c_i_a_r_i' a numeric vector, counts of individuals, belonging to the
          family

     '_T_i_p_u_l_i' a numeric vector, counts of individuals, belonging to the
          family

     '_T_o_t_a_l' a numeric vector, total count of individuals belonging to
          the suborder Nematocera

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

     ...

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

     data(Nematocera)

     par(mar=c(11,5,3,1))

     boxplot(Total ~ Treatment*Date, data=Nematocera, las=2, col=c("white","white","blue","green"))
     legend(x=15, y=100, legend=levels(Nematocera$Treatment), fill=c("white","white","blue","green"))

     pairs(Nematocera[,c("Cecido","Cerato","Chiro","Myceto","Psycho","Sciari")])

