The code, therefore, in Yee (2004) will not run without changing the
"g" to a "q".
Details
The former function cgo has been renamed cqo
because CGO (for canonical Gaussian ordination) is a confusing
and inaccurate name.
CQO (for constrained quadratic ordination) is better.
This new nomenclature described in Yee (2006).
References
Yee, T. W. (2004)
A new technique for maximum-likelihood
canonical Gaussian ordination.
Ecological Monographs,
74, 685--701.
Yee, T. W. (2006)
Constrained additive ordination.
Ecology, 87, 203--213.