Stabilizing selection: selection favoring intermediate values of a character over the extremes.
The substitution matrix P' for S' can be derived from the model parameters, without introducing new parameters: Given P', let i, j, k denote a tree node, and a, b, c ∈ S' possible values of a character at some node.
The value of a continuous character evolving on a phylogenetic tree is commonly modelled as the location of a particle moving under one-dimensional Brownian motion with constant rate.
An event – in story terms – equals meaningful change in the value-charged condition of a character's life, achieved through conflict".
A one-way hash value is a character string composed of a fixed number of seemingly random characters selected by a mathematical algorithm that cannot be reversed [ 3].
However, the user can manually modify the values of any character state in Step 3.2.
Next, the value of the character on a single tip was artificially inflated by a factor of ten, to represent a bout of adaptive evolution (or other event such as measurement error) on the branch leading to that tip.
The values of an evolving character were simulated under the Brownian motion model and values at internal nodes were reconstructed based on values at the tips only, first by fitting a Brownian motion model and second by fitting a stable model using the method presented later in this paper.
"War teaches you the value of an onion," one character explains while preparing dinner in the harrowing but credulity-straining "Honey Brown Eyes".
We attributed "0" (zero) value to the absence of a character (an association or a syntenic group that is conserved or changed by chromosome rearrangements) and "1" (one) value to the presence of the character.
To obtain the mean value of each character, we examined a total of 1,264 slide mounted specimens from 40 species (Table S2).
