1 Introduction

1 Introduction

There are many types network, such as Co-Authorship Network, Gene Co-expression Network, and Transportation Network. Here we only introduce the common analysis methods for world trade network.

2 Analysis Process

Commonly we follow the following step to analysis a trade network.

2.1 Weighted Network

The weighted matrix $W$ is defined as
\[w^t_{ij}=\frac{e^t_{ij}}{GDP^t_i}\]
where $e^t_{ij}$ is the exports from country $i$ to country $j$ in year $t$. $GDP^t_i$ is the total exports of country $i$ in year $t$.

1 Introduction

A selection of particularly useful web sites dealing with coral reef ecosystems are listed below. They are in no particular order and have been chosen for the wealth of useful links and information they contain. We have no doubt missed some key sites and would welcome suggestions for additions.

2 Websites Resources

Reef Guardian International

Protecting coral reefs and their marine life
http://www.reefguardian.org/

International Coral Reef Initiative

Introduction

There are many useful metrics to describe a network, according to which we can judge some characters of the network. In the following we list the definitions of some common metrics for weighted and unweighted networks. A weighted network associates a label (weight) with every edge in the network. Weights are usually real numbers. They may be restricted to rational numbers or integers. For unweighted network there is no label (weight) with every edge in the netwrok.

1 General Definitions for Unweighted Network

Introduction

The data presented here are the most widely-used, official-source development data from the UN, World Bank and other international agencies. Here are some useful economic statistics websites:

1 UN statistics

http://unstats.un.org/

Organization description