Functions that estimate sample (taxonomic) composition from
  biomarker data
bce1 estimates probability distributions of a sample composition
  based on an input ratio matrix, A, containing
  biomarker ratios in (field) samples, and an input data matrix,
  B, containing the biomarker ratios for several taxonomic groups
tlsce estimates the total least squares solution
  
This version differs from the previous version <2 in that a different
  MCMC method is used that shows better convergence properties and
  has a more sound underlying statistical model.