nlmixr version used for fitting:    2.0.6 
mkin version used for pre-fitting:  Dummy 0.0 for testing 
R version used for fitting:         Dummy R version for testing 
Date of fit:     Dummy date for testing 
Date of summary: Dummy date for testing 

Equations:
d_parent/dt = - ((k1 * g * exp(-k1 * time) + k2 * (1 - g) * exp(-k2 *
           time)) / (g * exp(-k1 * time) + (1 - g) * exp(-k2 * time)))
           * parent
d_m1/dt = + f_parent_to_m1 * ((k1 * g * exp(-k1 * time) + k2 * (1 - g)
           * exp(-k2 * time)) / (g * exp(-k1 * time) + (1 - g) *
           exp(-k2 * time))) * parent - k_m1 * m1

Data:
508 observations of 2 variable(s) grouped in 15 datasets

Degradation model predictions using RxODE

Fitted in test time 0 s

Variance model: Constant variance 

Mean of starting values for individual parameters:
       parent_0        log_k_m1 f_parent_qlogis          log_k1          log_k2 
         100.74           -5.43           -0.05           -2.85           -4.57 
       g_qlogis 
          -0.15 

Mean of starting values for error model parameters:
sigma_parent     sigma_m1 
           3            3 

Fixed degradation parameter values:
None

Results:

Likelihood calculated by gauss3_1.6  
   AIC  BIC logLik
  2465 2525  -1219

Optimised parameters:
                  est. lower  upper
parent_0        100.54  99.7 101.40
log_k_m1         -5.44  -5.6  -5.24
f_parent_qlogis  -0.06  -0.2   0.05
log_k1           -2.81  -3.0  -2.65
log_k2           -4.62  -4.8  -4.41
g_qlogis         -0.14  -0.4   0.17

Correlation: 
                prnt_0 lg_k_1 f_prn_ log_k1 log_k2
log_k_m1        -0.224                            
f_parent_qlogis -0.401  0.335                     
log_k1           0.119  0.083  0.019              
log_k2          -0.019  0.237  0.142  0.395       
g_qlogis         0.083 -0.282 -0.218 -0.532 -0.544

Random effects (omega):
                    eta.parent_0 eta.log_k_m1 eta.f_parent_qlogis eta.log_k1
eta.parent_0                0.05          0.0                0.00       0.00
eta.log_k_m1                0.00          0.1                0.00       0.00
eta.f_parent_qlogis         0.00          0.0                0.03       0.00
eta.log_k1                  0.00          0.0                0.00       0.05
eta.log_k2                  0.00          0.0                0.00       0.00
eta.g_qlogis                0.00          0.0                0.00       0.00
                    eta.log_k2 eta.g_qlogis
eta.parent_0              0.00          0.0
eta.log_k_m1              0.00          0.0
eta.f_parent_qlogis       0.00          0.0
eta.log_k1                0.00          0.0
eta.log_k2                0.08          0.0
eta.g_qlogis              0.00          0.1

Variance model:
sigma_parent     sigma_m1 
           4            1 

Backtransformed parameters:
                est. lower upper
parent_0       1e+02 1e+02 1e+02
k_m1           4e-03 4e-03 5e-03
f_parent_to_m1 5e-01 5e-01 5e-01
k1             6e-02 5e-02 7e-02
k2             1e-02 8e-03 1e-02
g              5e-01 4e-01 5e-01

Resulting formation fractions:
             ff
parent_m1   0.5
parent_sink 0.5

Estimated disappearance times:
       DT50 DT90 DT50back DT50_k1 DT50_k2
parent   27  170       51      12      70
m1      160  532       NA      NA      NA