Processes of Character Evolution Some characters evolve more
quickly than others; some characters depend on others in their
evolution. Discovering the nature of these evolutionary
processes for a character from an analytical point of view
involves determining a model and its parameters. For analyses
that involved combined models of character change, speciation
and extinction, see the page on Diversification. - Single
characters - Correlated characters Maximum Likelihood estimates
of rates and biases can be obtained for categorical characters
for two simple models, the Mk1 model and the AsymmMk model. For
more information on these models, see the page on ancestral
state reconstruction. Mesquite cannot yet estimate parameters
for models of DNA sequence evolution. Three modules provide
calculations to estimate parameters for the Mk1 and AsymmMk
models: These calculations consider a categorical character and
a tree. As such, they can be considered to be values describing
a character (and thus are available when a