add_graph_f4

The data frame to get the labels to compute the $f_4$ statistics from.

data

graph

The environment to evaluate the $f_4$ statistics in.


The data frame, <code>data</code>, must contain columns <code>W</code>, <code>X</code>, 
<code>Y</code>, and <code>Z</code>. The function then computes the $f_4(W, X; Y, Z)$
statistics (also known as the $D$ statistics) for all rows and adds these
as a column, <code>graph_f4</code>, to the data frame.


Implements tools for building and visualising admixture graphs
and for extracting equations from them. These equations can be compared to f-
statistics obtained from data to test the consistency of a graph against data --
for example by comparing the sign of f_4-statistics with the signs predicted by
the graph -- and graph parameters (edge lengths and admixture proportions) can
be fitted to observed statistics.

add_graph_f4: Evalutes the f_4 statistics for all rows in a data frame and extends the data frame with the graph f_4.

Description

Usage

Arguments

Value