> summary(fit1)

Call:
grm(data = SOdata, constrained = TRUE)

Model Summary:
   log.Lik      AIC    BIC
 -96657.64 193401.3 193696

Coefficients:
$Respondent1
         value
Extrmt1 -0.075
Extrmt2  2.318
Dscrmn   1.692

$Respondent2
         value
Extrmt1 -1.569
Extrmt2  1.157
Dscrmn   1.692

$Respondent3
         value
Extrmt1 -0.005
Extrmt2  2.543
Dscrmn   1.692

$Respondent4
         value
Extrmt1 -1.554
Extrmt2  1.329
Dscrmn   1.692

$Respondent5
         value
Extrmt1 -0.008
Extrmt2  2.478
Dscrmn   1.692

$Respondent6
         value
Extrmt1 -1.524
Extrmt2  1.268
Dscrmn   1.692

$Respondent7
        value
Extrmt1 0.093
Extrmt2 2.468
Dscrmn  1.692

$Respondent8
         value
Extrmt1 -1.516
Extrmt2  1.251
Dscrmn   1.692

$Respondent9
        value
Extrmt1 0.059
Extrmt2 2.543
Dscrmn  1.692

$Respondent10
         value
Extrmt1 -1.543
Extrmt2  1.284
Dscrmn   1.692

$Respondent11
        value
Extrmt1 0.071
Extrmt2 2.416
Dscrmn  1.692

$Respondent12
         value
Extrmt1 -1.542
Extrmt2  1.250
Dscrmn   1.692

$Respondent13
         value
Extrmt1 -0.039
Extrmt2  2.446
Dscrmn   1.692

$Respondent14
         value
Extrmt1 -1.652
Extrmt2  1.245
Dscrmn   1.692

$Respondent15
         value
Extrmt1 -0.110
Extrmt2  2.452
Dscrmn   1.692

$Respondent16
         value
Extrmt1 -1.650
Extrmt2  1.273
Dscrmn   1.692

$Respondent17
         value
Extrmt1 -0.058
Extrmt2  2.542
Dscrmn   1.692

$Respondent18
         value
Extrmt1 -1.597
Extrmt2  1.335
Dscrmn   1.692

$Respondent19
         value
Extrmt1 -6.107
Extrmt2 -0.066
Extrmt3  2.447
Dscrmn   1.692

$Respondent20
         value
Extrmt1 -6.347
Extrmt2 -1.624
Extrmt3  1.288
Dscrmn   1.692


Integration:
method: Gauss-Hermite
quadrature points: 21

Optimization:
Convergence: 0
max(|grad|): 2.1
quasi-Newton: BFGS