thu_fossilBM.Rmd

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# Background
FossilBM uses phylogenies of extant and extinct species (typically obtained through tip-dating) and quantitative traits to infer the mode of evolution and ancestral states at all nodes in the tree. The FBM model includes rate parameters describing how fast a trait evolves and trend parameters determining whether evolution is directional. When the trend parameter equals 0, the model reduces to a standard Brownian model of neutral evolution. Both the rate and trend parameters can very across the branches in the tree.

The algorithm simultaneously estimates:

1. the rates of phenotypic evolution and their variation across clades

2. the trends of phenotypic evolution and their variation across clades

3. the ancestral states at all internal nodes

The methods implemented here are described in: Early arrival and climatically-linked geographic expansion of New World monkeys from tiny African ancestors by D. Silvestro, M. F. Tejedor, et al. (Systematic Biology, 2018).

# Objectives
After this exercise the students will be able to execute an analysis of trait evolution, using the fossilized Birth Death model.

# Exercise

# Tutorial

## Load the data

## Set the analyses operators

## Start the analysis

## Interpret the results