maMed                 package:marray                 R Documentation

_S_t_r_a_t_i_f_i_e_d _m_e_d_i_a_n _c_a_l_c_u_l_a_t_i_o_n

_D_e_s_c_r_i_p_t_i_o_n:

     This function computes the median of values in 'y' separately
     within values of 'x'. It is used by 'maNormMed' for median
     location normalization.

_U_s_a_g_e:

     maMed(x, y, subset=TRUE)

_A_r_g_u_m_e_n_t_s:

       x: Variables used to stratify the data.

       y: A numeric vector.

  subset: A "logical" or "numeric" vector indicating the subset of
          points used to compute the median. 

_V_a_l_u_e:

     A numeric vector of median values.

_A_u_t_h_o_r(_s):

     Sandrine Dudoit, <URL: http://www.stat.berkeley.edu/~sandrine>.

_R_e_f_e_r_e_n_c_e_s:

     S. Dudoit and Y. H. Yang. (2002). Bioconductor R packages for
     exploratory analysis and normalization of cDNA microarray data. In
     G. Parmigiani, E. S. Garrett, R. A. Irizarry and S. L. Zeger,
     editors, _The Analysis of Gene Expression Data: Methods and
     Software_, Springer, New York.


     Y. H. Yang, S. Dudoit, P. Luu, and T. P. Speed (2001).
     Normalization for cDNA microarray data. In M. L. Bittner, Y. Chen,
     A. N. Dorsel, and E. R. Dougherty (eds), _Microarrays: Optical
     Technologies and Informatics_, Vol. 4266 of _Proceedings of SPIE_.


     Y. H. Yang, S. Dudoit, P. Luu, D. M. Lin, V. Peng, J. Ngai, and T.
     P. Speed (2002). Normalization for cDNA microarray data: a robust
     composite method addressing single and multiple slide systematic
     variation. _Nucleic Acids Research_, Vol. 30, No. 4.

_S_e_e _A_l_s_o:

     'maNormMain', 'maNormMed', 'median'.

_E_x_a_m_p_l_e_s:

     # See examples for maNormMain.