SocSciBot and Webometric Analyst Network Help Manual

If you are just starting with Webometric Analyst Network, please run through the tutorial introduction first.

Contents

Basic operations

Editing the network

Changing the appearance of the network

Moving and scaling the network

Partitioning the network

Web operations

Starting Webometric Analyst Network

Webometric Analyst Network can be started from within the web crawler program SocSciBot 4 or from the link analysis program Webometric Analyst. If you have data from either of these then you are recommended to start SocSciBot Network from within these programs. Otherwise, the easiest way to start Webometric Analyst Network is to install Webometric Analyst and run it from this program. Follow the instructions here to install Webometric Analyst.

When Webometric Analyst is installed, start it, select the classic interface option from the Wizard that appears first and select Draw Network from the File menu when the main screen appears. Webometric Analyst Network will appear with a default network showing.

Hint: There are some choices about which data to analyse, if this is a problem for you.

Opening networks

Select Load from the File menu and then the option Pajek Graph or Web Network from File. Use the dialog box that appears to select your file (e.g., SocscibotLinkAnalysisCybermetricsWebSites.net) and then click Open to view the file in Webometric Analyst Network. Note that SocSciBot and Webometric Analyst both sometimes pre-load networks into Webometric Analyst Network.


When the network is loaded it will appear in a random arrangement that is not very tidy. A layout algorithm can give a better arrangement of the network .

Automatically rearranging the network layout

In order to get an automatic rearrangement of the network in a form showing some network structure, the Fruchterman-Reingold algorithm can be used. To invoke this, select Fruchterman Reingold from the Layout menu.

The network will rearrange itself into a tidier pattern, perhaps something like the one below.

If the rearrangement is not satisfactory, select Fruchterman Reingold from the Layout menu again and see if it improves.

Fruchterman Reingold options

If the Fruchterman-Reingold algorithm does not give good results, it can be re-run in a different way. This can be achieved by changing the K multiplier in the F-R tab on the right of the screen.

Hint: Try moving the slider to increase the value of K and then rerunning the algorithm by selecting Fruchterman Reingold from the Layout menu again. Larger values of k try to force the nodes further apart in the network. Try a few different values of K and keep the one that works best for your network.

Sometimes you may want to ensure that one or more important nodes are in the center of the diagram after the Fruchterman-Reingold algorithm has finished. To ensure that this happens, the node can be pinned in place. To pin one or a group of nodes in place, first select them, then right click and select the Pin Selected Nodes option. The selected nodes will then not move during the Fruchterman-Reingold algorithm. To premove the pinning for one or a group of nodes, first select them, then right click and select the Unpin Selected Nodes option.

Moving nodes

Individual nodes can be moved around in order to improve the layout – for example to avoid overlapping names. To move a node, click on the centre of the node circle and then drag it to another place. The node will become green when you click on it to drag it if it has been selected. The node’s arrows will move with it.

Moving groups of nodes

iIt is not possible to move a group of nodes with drag and drop but they can either be moved individually or can all be given the same x coordinate.

To give a group of nodes the same x co-ordinate, first select them by clicking and dragging across them, then right click and select the Set New x Co-ordinate of Selected Nodes option and enter an x co-ordinate. This coordinate will be applied to all the selected nodes.

Changing properties of all nodes

It is possible to change lots of properties of the nodes in the network, including their position and size.

To change node sizes, make sure the Info tab is selected on the right hand side of the screen and slide around the slider labelled Overall Node Size Scaling. This will change the size of all nodes at the same time.

To toggle label backgrounds on/off, click Use White Text Background from the Appearance menu. This mainly affects the appearance of labels when they overlap arrows or nodes.

To toggle showing labels on/off, click Draw Node Labels from the Appearance menu. This mainly affects the appearance of labels when they overlap arrows or nodes.

To change the colour of all nodes, click Change All Node Colours from the Appearance menu and select a colour from the dialog box.

To change any other property of all nodes, select all the nodes in the network by clicking Select All Nodes from the Edit menu and then right-click to access the properties menu. See the section on changing properties of a group of nodes for more information.

Moving and scaling the entire network

To move the entire network around the screen, use the four arrow buttons at the bottom of the Info tab.If the Stretch Nodes option at the bottom is selected then the network will expand - the top left hand corner of the screen is fixed and the network is expanded towards the bottom right of the screen.

The entire network can be moved to the top-left hand corner of the screen (useful for printing) by selecting Move Network to Top Left Corner from the Layout menu.

The entire network can be stretched to fill the screen (useful for printing) by selecting Stretch Network to Fill Screen from the Layout menu.

Changing properties of all arrows

To change arrow widths, make sure the Info tab is selected on the right hand side of the screen and slide around the slider labelled Overall Arrow Width Scaling. This will change the width of all arrows at the same time.

To add or remove arrow heads from all arrows, select or deselect Draw Arrows on Lines from the Appearance menu.

To change the default colour for all arrows, select or deselect Change the Default Arrow Colour from the Appearance menu and then select the desired colour.

Changing properties of groups of nodes

It is possible to change lots of properties of a single node, or a group of nodes using right-click menus. The procedure for this is to first select the nodes to be changed by dragging the mouse across them and then right clicking and selecting a menu option for the desired feature to change. Note that nodes become green when selected and that left-clicking anywhere deselects the nodes.



To change the main colour of a group of nodes, first select them by clicking and dragging across them, then right click and select the Change Colour of Selected Nodes option and select a colour from the dialog box. This colour will be applied to all the selected nodes, but please note that the selected nodes will remain green until you click somewhere away from them to release them from being selected.

To change the border colour of a group of nodes, first select them, then right click and select the Change Border Colour of Selected Nodes option and select a colour from the dialog box. This colour will be applied to all the selected nodes.

To change the shape of a group of nodes, first select them, then right click and select the Change Shape of Selected Nodes option and enter either Circle or Square. This shape will be applied to all the selected nodes.

To change the size of a group of nodes, first select them, then right click and select the Change Size of Selected Nodes option and enter a whole number or -1 to cancel. The default node size is 20 so larger numbers will increase the node size and smaller numbers will decrease it. This size will be applied to all the selected nodes.

To change the border width of a group of nodes, first select them, then right click and select the Change Border Width of Selected Nodes option and enter a whole number from 1 to 5 or -1 to cancel. The default is 1 so larger numbers will increase the border width . This size will be applied to all the selected nodes. Note that border width changes are not saved when the network is saved.

To change the label font of a group of nodes, first select them, then right click and select the Change Font of Selected Nodes option and select a font from the dialog box. This colour will be applied to all the selected nodes. Note that font changes are not saved when the network is saved.

Hint: The purpose of these options is so that different information can be coded in the network. For example, all nodes from the same country or web site could be given the same colour.

Hint: If you want to use the right-click menu options on all nodes in the network then they can all be easily selected by using the Select All Nodes option in the Edit menu.

Changing properties of an individual node

Most properties of an individual node can be changed using the procedures for changing properties of a group of nodes after just selecting the single node.

To rename a node (change its label), first select it by clicking on the node, then right click and select the Rename One Selected Node option and enter a new name for the node.

Deleting one or more nodes

To delete one or more nodes, first select the nodes to be deleted by clicking and dragging across them, then right click and select the Delete Selected Nodes and Connected Arrows option. The selected nodes will be deleted and all arrows connected to any of the nodes will also be removed..

Saving networks

To save a network, use Save As Web Network File from the File menu. Choose Save as a Pajek File instead if you are going to load the network into Pajek. Note that not all information is saved. For example, font names are not saved.

Hint: To get a high quality picture of the network as a file, it can be printed to a file, using Print from the File menu and selecting a printer that creates a file. Many computers have a Document Writer printer that can do this. If you need a very high quality image then you will need to install a “TIFF printer driver” and then print the high quality image using this. This option can give high resolution images for academic papers.

Printing networks

To print a network, select Print from the File menu.

Starting a new network

To start a new network, delete all the nodes in the existing network. The easiest way to do this is to choose Select All Nodes from the Edit menu and then right-click and choose Delete Selected Nodes and Connected Arrows from the right-click menu.

Adding nodes

To add a node, select Add Node from the Edit menu and enter a name for the node. It will be placed at random in the network.

Adding arrows

To add an arrow, select Add Arrow from the Edit menu and enter a the number of the source node and the target node and a width for the arrow. Node numbers can be found by clicking on them and reading the Info tab on the right of the screen.

Deleting arrows

To delete an arrow, select Delete Arrow from the Edit menu and enter a the number of the source node and the target node. Node numbers can be found by clicking on them and reading the Info tab on the right of the screen.

Selecting nodes

Sselect nodes by clicking to one side of them and then dragging the mouse to the other side of them before releasing the left mouse button. This selects all nodes in a rectagular area from the point of the first click to the point where the mouse was released. The selected nodes will be coloured green.

Finding information about a given node

The number, label, colour, x and y coordinates of nodes can be found by clicking on them and reading the About box in the Info tab on the right of the screen.

Clustering and colouring nodes

The network nodes can be automatically coloured so that nodes that tend to cluster together (as measured by links between them) tend to be the same colour. To do this, from the Partition menu, select the Colour Nodes by Community option and the As Many Communities as Possible sub- option, accepting the default value in the subsequent bos. This uses Mark Newman's community identification algorithm to select colours for nodes so that clusters or communities of nodes tend to have the same colour. Adjusting the parameter in the final box can give smaller or larger communities, and other options allow a predefined number of clusters to be identified.

Downloading pages and adding links

If the label of a node is a URL (with our without the initial http://) then the URL can be downloaded, its links extracted and added to the network as new arrows and nodes. To do this, select the node (or a group of nodes with URL labels) by clicking on it. Right click and select Download the Selected Node(s) and Add Links to the Network. After the downloading is finished (as indicated by the hour glass cursor reverting to normal) - which may take a few seconds per page - the new links will be added to the diagram.

Crawling to add extra links and nodes

If the label of a node is a URL (with our without the initial http://) then a crawl can be started from that URL. This means that the URL is downloaded, its links extracted and added to the network as new arrows and nodes. This is then repeated for all the new pages found as many times as specified. To do this, select the node (or a group of nodes with URL labels) by clicking on it. Right click and select Crawl (Recursively Download) from Selected Node(s) and add Links to Diagram. Enter a number in the next dialog box corresponding to the depth of crawling but beware of using numbers greater than 2! If you just want links from one web site then enter the domain name of the web site in the second box asking for matching text, otherwise leave it blank. After the downloading is finished (as indicated by the hour glass cursor reverting to normal) - which may take a few seconds per page - the new links will be added to the diagram.