get_PLSR_NA

an (already centered) vector of order n;
  <code>NA</code> not allowed

an (already centered) n x p matrix; <code>NA</code>
  allowed but with at least one observation for every row
  and column

ncomp

Internal function not to be called by the user

Partial Least Squares Path Modeling (PLS-PM)
analysis for both metric and
non-metric data, as well as REBUS analysis.

Do NOT use this function unless you are ME, a package
  developer, or a jedi user who really knows what is doing
  (seriously!)