```r
m.L1.SFO <- mkinfit("SFO", FOCUS_2006_L1_mkin, quiet = TRUE)
summary(m.L1.SFO)
```

```
## mkin version:    0.9.44.9000 
## R version:       3.3.1 
## Date of fit:     Wed Oct 26 23:18:11 2016 
## Date of summary: Wed Oct 26 23:18:11 2016 
## 
## Equations:
## d_parent = - k_parent_sink * parent
## 
## Model predictions using solution type analytical 
## 
## Fitted with method Port using 37 model solutions performed in 0.089 s
## 
## Weighting: none
## 
## Starting values for parameters to be optimised:
##               value   type
## parent_0      89.85  state
## k_parent_sink  0.10 deparm
## 
## Starting values for the transformed parameters actually optimised:
##                       value lower upper
## parent_0          89.850000  -Inf   Inf
## log_k_parent_sink -2.302585  -Inf   Inf
## 
## Fixed parameter values:
## None
## 
## Optimised, transformed parameters with symmetric confidence intervals:
##                   Estimate Std. Error  Lower  Upper
## parent_0            92.470    1.36800 89.570 95.370
## log_k_parent_sink   -2.347    0.04057 -2.433 -2.261
## 
## Parameter correlation:
##                   parent_0 log_k_parent_sink
## parent_0            1.0000            0.6248
## log_k_parent_sink   0.6248            1.0000
## 
## Residual standard error: 2.948 on 16 degrees of freedom
## 
## Backtransformed parameters:
## Confidence intervals for internally transformed parameters are asymmetric.
## t-test (unrealistically) based on the assumption of normal distribution
## for estimators of untransformed parameters.
##               Estimate t value    Pr(>t)    Lower   Upper
## parent_0      92.47000   67.58 2.170e-21 89.57000 95.3700
## k_parent_sink  0.09561   24.65 1.867e-14  0.08773  0.1042
## 
## Chi2 error levels in percent:
##          err.min n.optim df
## All data   3.424       2  7
## parent     3.424       2  7
## 
## Resulting formation fractions:
##             ff
## parent_sink  1
## 
## Estimated disappearance times:
##         DT50  DT90
## parent 7.249 24.08
## 
## Data:
##  time variable observed predicted residual
##     0   parent     88.3    92.471  -4.1710
##     0   parent     91.4    92.471  -1.0710
##     1   parent     85.6    84.039   1.5610
##     1   parent     84.5    84.039   0.4610
##     2   parent     78.9    76.376   2.5241
##     2   parent     77.6    76.376   1.2241
##     3   parent     72.0    69.412   2.5884
##     3   parent     71.9    69.412   2.4884
##     5   parent     50.3    57.330  -7.0301
##     5   parent     59.4    57.330   2.0699
##     7   parent     47.0    47.352  -0.3515
##     7   parent     45.1    47.352  -2.2515
##    14   parent     27.7    24.247   3.4528
##    14   parent     27.3    24.247   3.0528
##    21   parent     10.0    12.416  -2.4163
##    21   parent     10.4    12.416  -2.0163
##    30   parent      2.9     5.251  -2.3513
##    30   parent      4.0     5.251  -1.2513
```