Mathematica software for indirect tree-growth modeling with piecewise linear regression

The Mathematica notebook carries out all calculations for the manuscript "Modeling tree growth-curves indirectly with piecewise linear regression and explaining factors, when tree ages are unknown" (in review). The two Excel files are two different input files. Please see the instruction file for details of how to use the notebook. For just inspecting the code, without the Mathematica software, the notebook and output files are provided as PDF files.