fiberLD:Fiber Length Determination
Routines for estimating tree fiber (tracheid) length distributions in the standing tree based on increment core
samples. Two types of data can be used with the package,
increment core data measured by means of an optical fiber
analyzer (OFA), e.g. such as the Kajaani Fiber Lab, or measured
by microscopy. Increment core data analyzed by OFAs consist of
the cell lengths of both cut and uncut fibres (tracheids) and
fines (such as ray parenchyma cells) without being able to
identify which cells are cut or if they are fines or fibres.
The microscopy measured data consist of the observed lengths of
the uncut fibres in the increment core. A censored version of a
mixture of the fine and fiber length distributions is proposed
to fit the OFA data, under distributional assumptions (Svensson
et al., 2006) <doi:10.1111/j.1467-9469.2006.00501.x>. The
package offers two choices for the assumptions of the
underlying density functions of the true fiber (fine) lenghts
of those fibers (fines) that at least partially appear in the
increment core, being the generalized gamma and the log normal
densities.
