Description Usage Arguments Details Value Author(s) References See Also Examples
Determines if contrasts are estimable, that is, if the contrasts can be written as a linear function of the data.
1  is_estimable(K, null.basis)

K 
A matrix. 
null.basis 
A basis for a null space (can be found with

Consider the setting E(Y)=Xb. A linear function of b,
say l'b is estimable if and only if there exists an r such
that r'X=l' or equivalently l=X'r. Hence l must be in
the column space of X', i.e. in the orthogonal complement of the
null space of X. Hence, with a basis B for the null space,
is_estimable()
checks if each row l of the matrix K is
perpendicular to each column basis vector in B.
A logical vector.
S<c3><b8>ren H<c3><b8>jsgaard, [email protected]
http://web.mit.edu/18.06/www/Essays/newpaper_ver3.pdf
1  ## TO BE WRITTEN

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