Social Network Analysis and R
Emmanuel F. Koku wrote:
I'm interested in computing densities of a number of small ego-centred or local networks. I've installed both the R program and the sna package. My next task is importing the data into R. Our data was entered into Spss in an edgelist format in which each case specifies the link between an alter and an ego. For example: 10101 10102 1 10101 10103 3 10102 10104 2 10201 10203 4 10203 10204 2 The following data fragment for example shows an ego-centred network of 2 persons: 101 and 102. Person 101 for example reports of a closeness of ties between alters 01 and 02 = value of 1; alters 01 and 03 - value of 3, etc. Similarly Person 102 reports on the closeness of ties between his alters 01 and 03 = value of 4; and alters 03 and 04=value of 2. We have about 350 of these small ego networks represented as 560 cases in edgelist format in spss (each line or ego-alter relational link represents a case in spss). First, how do I write out the commands in R to read the edgelists ? Secondly, is there any way to tell R that the first 3 characters of the ego and alter values are actually identifiers for the ego networks -- so that densities are computed for each these? I've begun reading the reference manual on data reading and import facilities and hope that would help me get further along.
[The question arises why you did not finish it before asking.] See ?read.fwf for importing the data. Uwe Ligges