Patrick,
PAST is "free" as in "free beer", not as in *free speech*. It is gratis,
but not open. The problem you have is just typical of such black box
approach to scientific software development -- since one cannot see the
source code, it is not possible to check how this or that algorithm is
impl
I can’t help you with PAST, but this reference will allow you to compute the
correct statistics for a standardized major axis (often erroneously called a
reduced major axis) regression.
Warton, D. I., et al., 2006, Bivariate line-fitting methods for allometry:
Biological Reviews, v. 81, no. 2,
I don't know about how to do it in PAST, but note that because the slope of the
standard major axis "regression" line is just the signed ratio of two standard
deviations, its square follows the F-distribution if one assumes that the two
variances are based on random samples from two normally dis
