retcor-methods             package:xcms             R Documentation

_C_o_r_r_e_c_t _r_e_t_e_n_t_i_o_n _t_i_m_e _f_r_o_m _d_i_f_f_e_r_e_n_t _s_a_m_p_l_e_s

_D_e_s_c_r_i_p_t_i_o_n:

     To correct differences between retention times between different
     samples, a number of of methods exist in XCMS. 'retcor' is the
     generic method.

_A_r_g_u_m_e_n_t_s:

  object: 'xcmsSet-class' object

  method: Method to use for retention time correction. See details.

     ...: Optional arguments to be passed along

_D_e_t_a_i_l_s:

     Different algorithms can be used by specifying them with the
     'method' argument. For example to use the approach described by
     Smith et al (2006) one would use: 'retcor(object,
     method="loess")'. This is also the default.

     Further arguments given by '...' are passed through to the
     function implementing the 'method'. 

     A character vector of _nicknames_ for the  algorithms available is
     returned by  'getOption("BioC")$xcms$retcor.methods'. If the
     nickname of a method is called "loess", the help page for that
     specific method can be accessed with '?retcor.loess'.

_V_a_l_u_e:

     An 'xcmsSet' object with corrected retntion times.

_M_e_t_h_o_d_s:


     _o_b_j_e_c_t = "_x_c_m_s_S_e_t" ' retcor(object, ...) '


_S_e_e _A_l_s_o:

     'retcor.loess' 'retcor.obiwarp' 'xcmsSet-class',

