[Rsiena-help] Some parameters are lack of convergence t-ratio

[Shupin Li]

Dear folks,

I have data of a 20 people network in 5 time waves and their gender. I wanted to specify models for dynamics of networks with some basic network effects and gender homophily. I used below commands, but some parameters (rate parameters) are lack of convergence t-ratio in the outcome (though the overall maximum convergence ratio looked nice). 

Why don't I have convergence t-ratios for those rate parameters? How shall I solve this problem?

> myCoEvolutionEff <- includeEffects( myCoEvolutionEff, transTrip, cycle3)
> myCoEvolutionEff <- includeEffects( myCoEvolutionEff, simX, interaction1 = "gender" )
> myCoEvAlgorithm <- sienaAlgorithmCreate( projname = 'CoEv_5' ) # define the algorithm settings
> betterCoEvAlgorithm <- sienaAlgorithmCreate( projname = 'CoEv_5', diagonalize = 0.2, doubleAveraging = 0)
> (ans <- siena07( betterCoEvAlgorithm, data = myCoEvolutionData, effects = myCoEvolutionEff ))
> ans
Estimates, standard errors and convergence t-ratios

                                                  Estimate   Standard        Convergence 
                                                                 Error                   t-ratio   

Rate parameters: 
  0.1      Rate parameter period 1  6.1412  ( 1.2194   )             
  0.2      Rate parameter period 2  5.4820  ( 1.1153   )             
  0.3      Rate parameter period 3  4.2816  ( 0.8480   )             
  0.4      Rate parameter period 4  3.2814  ( 0.6573   )             

Other parameters: 
  1.  eval outdegree (density)       -1.0531  ( 0.2341   )           -0.0327   
  2.  eval reciprocity                      0.7823  ( 0.1933   )           -0.0414   
  3.  eval transitive triplets              0.1559  ( 0.0223   )           -0.0400   
  4.  eval 3-cycles                         -0.1406  ( 0.0411   )           -0.0349   
  5.  eval gender similarity              0.9369  ( 0.1561   )           -0.0906   

Overall maximum convergence ratio:    0.1234 
Total of 2249 iteration steps.

Any hints are appreciated highly. Thanks a lot in advance!

Best,
Shupin