diffFilter-methods            package:xps            R Documentation

_D_i_f_f_e_r_e_n_c_e _F_i_l_t_e_r

_D_e_s_c_r_i_p_t_i_o_n:

     This method initializes the Difference Filter. 
      The difference is the maximum value minus minimum value for each
     row of the expression dataframe divided by the mean value of each
     row. 
      The Difference Filter flags all rows with: 'flag = ((max -
     min)/mean >= cutoff)'

     _Usage_

     'diffFilter(object)' 
      'diffFilter(object, value)<-'

_A_r_g_u_m_e_n_t_s:

  object: object of class 'PreFilter'.

   value: numeric vector 'c(cutoff, trim, epsilon)'.

_D_e_t_a_i_l_s:

     The method 'diffFilter' initializes the following parameters:

         'cutoff':   the cutoff level for the filter.
         'trim':     the trim value for trimmed mean (default is 'trim=0').
         'epsilon':  value to replace mean (default is 'epsilon=0.01'):
                     'epsilon > 0': replace mean=0 with epsilon.
                     'epsilon = 0': always set mean=1.

     Note, that for 'epsilon = 0' the filter flags all rows with: (max
     - min) >= cutoff

_V_a_l_u_e:

     An initialized 'PreFilter' object.

_A_u_t_h_o_r(_s):

     Christian Stratowa

_E_x_a_m_p_l_e_s:

     prefltr <- PreFilter()
     diffFilter(prefltr) <- c(2.2,0.0,0.01)
     str(prefltr)

