[Rsiena-help] What does this error mean?

[Ruth Ripley]

Dear Jennifer,

The errors both indicate that you are fitting a model which is too 
complicated for your data. I suggest you start with just the default 
effects and add others one by one to see which one is giving the problem.

Regards,

Ruth

On 09/03/2012 02:45, Victor, Jennifer Nicoll wrote:
> After letting my RSiena model for 12 hours on a high memory machine I received the following output.  What advice can you provide to help me overcome this error?
>
>> myusmodel<-sienaModelCreate(useStdInits=FALSE, projname='siena_us_01')
>> usans01<-siena07(myusmodel, data=myusdata,effects=myeffus)
> No X11 device available, forcing use of batch mode
> Start phase 0
> theta: 0.0342 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
>
> Start phase 1
> Phase 1 Iteration 1 Progress: 0%
> Phase 1 Iteration 2 Progress: 0%
> Phase 1 Iteration 3 Progress: 0%
> Phase 1 Iteration 4 Progress: 0%
> Phase 1 Iteration 5 Progress: 0%
> Phase 1 Iteration 10 Progress: 0%
> Phase 1 Iteration 15 Progress: 0%
> Phase 1 Iteration 20 Progress: 1%
> Phase 1 Iteration 25 Progress: 1%
> Phase 1 Iteration 30 Progress: 1%
> Phase 1 Iteration 35 Progress: 1%
> Phase 1 Iteration 40 Progress: 1%
> Error in solve.default(z$dfra) :
>    system is computationally singular: reciprocal condition number = 4.58224e-20
> theta:  0.03416  0.01123 -0.01203 -0.00364 -0.17691 -0.40977  0.23908 -0.14365  0.25761  1.00000  0.21070
>
> Start phase 2.1
> Phase 2 Subphase 1 Iteration 1 Progress: 14%
> Phase 2 Subphase 1 Iteration 2 Progress: 14%
> theta  0.04034  0.01130 -0.01206 -0.00342 -0.17012 -0.40569  0.24425 -0.13712  0.25683  0.99919  0.20914
> ac 1.063 1.049 1.006 1.044 1.025 1.063 1.067 1.065 0.651 0.954 0.866
> Phase 2 Subphase 1 Iteration 3 Progress: 14%
> Phase 2 Subphase 1 Iteration 4 Progress: 14%
> theta  0.05223  0.01144 -0.01213 -0.00299 -0.15670 -0.39786  0.25405 -0.12452  0.25377  0.99722  0.20489
> ac 1.136 1.112 1.013 1.096 1.105 1.134 1.161 1.137 0.690 0.984 0.881
> Phase 2 Subphase 1 Iteration 5 Progress: 14%
> Phase 2 Subphase 1 Iteration 6 Progress: 14%
> theta  0.06332  0.01158 -0.01221 -0.00256 -0.14449 -0.39056  0.26230 -0.11261  0.24601  0.99419  0.19779
> ac 1.137 1.140 0.936 1.145 1.104 1.136 1.164 1.140 0.863 0.962 0.967
> Phase 2 Subphase 1 Iteration 7 Progress: 14%
> Error in x$FRAN(zsmall, xsmall) :
>    Unlikely to terminate this epoch:  more than 1000000 steps
> Calls: siena07 ... proc2subphase ->  doIterations ->  <Anonymous>  ->  .Call
> Execution halted
>
>
>
> Jennifer N. Victor
> Assistant Professor of Political Science
> University of Pittsburgh
> 4600 Posvar Hall
> jnvictor at pitt.edu
> (412) 624-7204
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