Supplement 1. Maple file for constructing conditional probability tables from signed directed graphs, SDG graphical editor program, example BBNs for the parasitoid and lake mesocosm studies, and instruction guide for SDG-BBN construction.

File List
Guide.pdf -- Instruction guide for SDG-BBN construction

CPT Builder.mws -- Maple file that constructs conditional probability tables

SDG Graphical Editor -- InstallAnywhere Self Extractor application that allows user to draw SDG and construct the transposed signed adjacency matrix °A

parasitoid.neta -- Bayes net for parasitoid example

lake.neta -- Bayes net for mesocosms example

Description
This instruction guide Guide.pdf describes in detail the transition from a signed directed graph (SDG) to a
Bayesian Belief Network (BBN). The
instruction guide begins by deriving the qualitative mathematics for the
host-parasitoid example. Instructions are given for drawing an SDG and the associated matrix
ºA using the SDG Graphical Editor. The guide shows how to construct the
conditional probabilities using the Maple file CPT
Builder.mws. Example Bayes
nets are included for the parasitoid example (parasitoid.neta)
and the lake mesocosms example (lake.neta). These latter two files use the BBN
software Netica, available at www.norsys.com.