discretizeExpressionValues        package:DFP        R Documentation

_F_u_n_c_t_i_o_n _t_o _d_i_s_c_r_e_t_i_z_e _g_e_n_e _e_x_p_r_e_s_s_i_o_n _d_a_t_a

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

     Discretizes the gene expression data (float values) into Low,
     Medium or High labels.

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

     discretizeExpressionValues(rmadataset, mfs, zeta = 0.5, overlapping = 2)

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

rmadataset: 'ExpressionSet' with numeric values containing gene
          expression values (rows) of samples belonging to different
          categories (columns).
            The 'ExpressionSet' also contains an 'AnnotatedDataFrame'
          with metadata regarding the classes to which each sample
          belongs.

     mfs: _Membership functions_ to determine the discret value
          (linguistic label) corresponding to a given gene expression
          level. 

    zeta: Threshold value which controls the activation of a linguistic
          label ('Low', 'Medium' or 'High').
            The lower, the less posibilities of having genes with more
          than one assigned linguistic label.
           'Default value = 0.5'. 'Range[0,1]'. 

overlapping: Modifies the number of membership functions used in the
          discretization process.
            Possible values: 

             1.  Low, Medium, High.

             2.  Low, Low-Medium, Medium, Medium-High, High.

             3.  Low, Low-Medium, Low-Medium-High, Medium,
                Medium-High, High.

          'Default value = 2'. 

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

     Matrix containing discrete values according to the overlapping
     parameter after discretizing the gene expression values.
       Includes an attribute types which determines the category of
     each sample.

_A_u_t_h_o_r(_s):

     Rodrigo Alvarez-Gonzalez
      Daniel Glez-Pena
      Fernando Diaz
      Florentino Fdez-Riverola
      Maintainer: Rodrigo Alvarez-Gonzalez <rodrigo.djv@uvigo.es>

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

     F. Diaz; F. Fdez-Riverola; D. Glez-Pena; J.M. Corchado. Using
     Fuzzy Patterns for Gene Selection and Data Reduction on Microarray
     Data. 7th International Conference on Intelligent Data Engineering
     and Automated Learning: IDEAL 2006, (2006) pp. 1095-1102

