Decomp                package:BSagri                R Documentation

_A _s_i_m_u_l_a_t_e_d _d_a_t_a _s_e_t

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

     A simulated data set, mimicking an experiment on the decomposition
     of plant material from four different varieties in soil.

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

     data(Decomp)

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

     A data frame with 1152 observations on the following 5 variables.

     '_B_l_o_c_k' a numeric vector, giving the names of the Blocks

     '_P_I_D' a numeric vector, giving the the number of the experimental
          unit

     '_V_a_r_i_e_t_y' a factor with levels 'N' 'S1' 'S2' 'S3', specifying the
          variety assigned to the experimental unit, randomized within
          each Block

     '_T_i_m_e' a factor with levels 't1' 't2' 't3' 't4' 't5' 't6',
          specifying time points at which measurements were taken

     '_P_e_r_c' a numeric vector, giving the percentage of material

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

     The experiment is a randomized complete block design, with
     repeated measurements within each experimental unit and additional
     subsamplings within each time point. Plant material from four
     different varieties was deposited in bags in soil of 32
     experimental units (coded by the variable PID), where the
     varieties had been grown in the vegetation period before. A total
     number of 36 bags was placed in each experimental unit. At six
     different time points, plant material was excavated and the
     content of the bags was analysed concerning the percentage of
     decomposition relative to the content at the begin of the
     experiment. At each time point, six bags were excavated at each
     experimental unit. Some bags could not be found anymore (data
     missing). The objective was to assess whether properties of the
     varieties obstruct the decompostion of plant material in the soil.
     The variety 'N' is of special interest, while the varieties 'S1',
     'S2', 'S3' are standard varieties.  

     Note, that this data set merely serves as an example to evaluate
     clustered data. Neither in the mean effects nor in the actual data
     points it does resemble a true experiment!

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

     Simulated.

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

     Mimicking an experiment performed by Sabine Prescher (JKI
     Braunschweig).

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

     data(Decomp)

