Table 2.
Correlation (above the diagonal), standard deviation (on the diagonal; in bold font), and covariance (below the diagonal) of all explanatory variables used in our models. Note: all variables are standardized (divided by their standard deviation) before estimating the models to yield standardized parameters. The table below reports the standard deviation and covariance of the unstandardized variables. Labels refer to: age homophily (diff.age), average age of contacts (avg.age), sex homophily (diff.sex), average sex of contacts (avg.sex), individual contact popularity (ind.cont.pop), joint contact popularity (joint.cont.pop), reciprocity (recip), contact activity (cont.act), nominations among contacts (nominate.cont), and shared referee (shared.ref)
| ind.cont | joint.cont | nominate | shared | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| diff.age | avg.age | diff.sex | avg.sex | pop | pop | recip | cont.act | cont | ref | |
| diff.age |
|
0.139 |
0.000 | 0.000 | 0.072 | 0.001 | 0.000 |
0.085 |
0.000 | 0.001 |
| avg.age |
32.421 |
|
0.000 | 0.007 |
0.051 |
0.001 |
0.001 | 0.074 | 0.000 | 0.000 |
| diff.sex | 0.001 | 0.000 |
|
0.055 |
0.000 | 0.000 | 0.002 | 0.000 | 0.000 | 0.001 |
| avg.sex | 0.001 | 0.041 |
0.006 |
|
0.007 | 0.000 |
0.001 |
0.004 |
0.001 |
0.001 |
| ind.cont.pop | 0.416 |
0.37 |
0.000 | 0.001 |
|
0.006 |
0.002 |
0.193 |
0.004 | 0.003 |
| joint.cont.pop | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
|
0.009 |
0.001 |
0.074 | 0.031 |
| recip | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
|
0.006 | 0.104 | 0.154 |
| cont.act |
0.447 |
0.487 | 0.000 |
0.001 |
0.031 |
0.000 | 0.000 |
|
0.005 | 0.000 |
| nominate.cont | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
|
0.143 |
| shared.ref | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 | 0.000 |
|