na                  package:marray                  R Documentation

_B_a_s_i_c _S_t_a_t_i_s_t_i_c_a_l _F_u_n_c_t_i_o_n_s _f_o_r _H_a_n_d_l_i_n_g _M_i_s_s_i_n_g _V_a_l_u_e_s

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

     Basic statistical functions for handling missing values or NA. 
       In 'log.na', 'sum.na', 'mean.na' and 'var.na', 'quantile.na',
     'length.na', missing values are omitted from the calculation. 
       The function 'cor.na' calls 'cor' with the argument
     'use="pairwise.complete.obs"'. 
       The function 'order.na' only handles vector arguments and not
     lists.  However, it gives the option of omitting the NAs
     ('na.last=NA'), of placing the NAs at the start of the ordered
     vector ('na.last=F') or at the end ('na.last=T'). 
       The function 'scale.na' is a modified version of 'scale' which
     allows NAs in the variance calculation. If 'scale = T', the
     function 'f' in 'scale.na' uses 'var.na' to perform the variance
     calculation. The function 'prod.na' is similar to the 'prod'
     function with 'na.rm=TRUE'. This function returns the product of
     all the values present in its arguments, omitting any missing
     values.

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

     Yee Hwa Yang, jean@biostat.berkeley.edu 

_S_e_e _A_l_s_o:

     'log', 'sum', 'mean', 'var', 'cor', 'order', 'scale', 'prod'.

