AIP Software: MTGSAM - Threshold Version
You are here: Beltsville Area Home / Beltsville Agricultural Research Center / Animal Genomics and Improvement Laboratory / Animal Improvement Program


MTGSAM: Threshold version

This set of programs is described in "Bayesian analysis of twinning and ovulation rates using a multiple-trait threshold model and Gibbs sampling" by C.P. Van Tassell, L.D. Van Vleck, and K.E. Gregory (Journal of Animal Science 76:2048–2061, 1998).

Be warned that there are still some bugs in this software. The same problem exists with missing traits as with the first linear model version (that correction has not yet been applied to the threshold programs).

Starting values for thresholds for traits with more than 2 categories sometimes blow up when starting. I have had trouble replicating this problem – if you have a small data set that can generate this problem, I would appreciate your contacting me and allowing me to use that data for debugging purposes. Note that if the program does not stop because of this bug, the results should be correct.

I would appreciate any feedback or notice of any bugs or problems encountered with this software.

If you have not done so, please register as a user of MTGSAM!


Please direct questions, comments, and program problems to Curt Van Tassell.

Last Modified: 01/12/2017