***** To join INSNA, visit http://www.insna.org ***** Good questions Bruce! That is why I put up my simple model for all SOCNET to see... and comment on. I had many of those questions myself. http://www.orgnet.com/mideast.html In the mideast example I am really showing 2 networks concurrently -- one of alliance or support and the other of repulsion or "sworn enemy." You see both visible links[positive ties drawn in gray] and invisible links that only have repelling forces. The networks are both active at the same time, and therefore the whole graph experiences both attraction and repulsion concurrently -- based on topology -- who is connected to whom and how. As you notice there are no lines/links/edges between those who are enemies -- just a repulsive force. The "invisible" repulsion makes sense to me because it does not let nodes who are identified enemies settle close to each other in the simple spring embedder algorithm -- move alQaida near the US, EU or Israel and you will see the nodes quickly push apart, dragging their linked neighbors [those with visible edges] with them. Iraq and USA was an interesting problem for me -- I did not know whether to state it as a positive or negative relationship. One can argue both sides, and a third -- it is both! It is probably not an OR relationship but an AND relationship -- alliance and repulsion at the same time. I will make that update now and see what happens. OK, I just made the change and watched the network self-organize... the overall pattern has not changed much, though Iraq is consistently pushed closer to Russia as a result. Valdis On Jul 25, 2006, at 5:11 PM, Neubauer, Bruce wrote: > ***** To join INSNA, visit http://www.insna.org ***** > > I am confused by the notion of negative relationships. It seems to me > that if there are two poles to the meaning of a relationship it should > be modeled as two relationships and not as one relationship with > positive and negative values. I see the presence or absence of a > relationship as a question independent of the strength and meaning of a > relationship if one exists. Perhaps this is a question of the > distinction between strength of relationship and meaning > (interpretation) of a relationship. How can the strength of a > relationship be negative when zero represents the absence of a > relationship? Measures of things like love and hate are not > necessarily > mutually exclusive in a linear way. Also, is it more intuitive to > represent the strength of a relationship by the thickness or color of > the line rather than by the length of the line (or the distance between > the nodes)? Does a long line between nodes intuitively suggest a > strong > association (the length of the line) or a weak association (the > distance > between nodes)? > > Bruce _____________________________________________________________________ SOCNET is a service of INSNA, the professional association for social network researchers (http://www.insna.org). To unsubscribe, send an email message to [log in to unmask] containing the line UNSUBSCRIBE SOCNET in the body of the message.