The final two columns are the lower and upper endpoints for the confidence interval, i.e. The fourth column is the length of half of the confidence interval.
The third column indicates the number of data values for which the average and confidence interval was calculated. The second column indicates the level of the confidence interval, i.e. The first column indicates the data collector and statistic for which the confidence interval has been calculated. The replication log files are saved in the Replication Log Files Directory.īelow is an excerpt from a confidence interval report named confidenceintervals95.txt. sum (only if the data collector calculates untimed statistics).For each data collector, the following values are saved in replication log files: These values are then saved in replication log files. The IID values for a number of different statistics are collected at the end of each simulation when running simulation replications. By running multiple simulations, several IID estimates of a particular value, such as average marking size, or minimum list length can be collected. Running another simulation would most likely result in a different estimate of the average for the data collector in question. This means that the average of the data values at the end of the simulation is just one estimate of what the average for the data collector should be. A number of different statistics are calculated for that data collector at the end of a simulation. Suppose that a data collector named DC is defined for a net. When simulation replications are run and a net contains data collector monitors, then some of the statistics that are calculated at the end of each simulation are used to calculate more reliable statistics that are based on data from the independent simulation replications.
This is what caused the difference between the model time in the simulation performance report and the current model time that was shown in the net overview after the simulation stopped. If simulation stop criteria are met in a timed simulation at a time when there are no more enabled transitions, then CPN Tools will attempt to increase the model time to the next time at which a transition is enabled when simulation feedback is updated. However, the figure below shows the current model time to be 11163 after the simulation feedback was updated after the simulation stopped. The simulation performance report was saved when model time was 11131. The simulation performance report shown above was generated after the Fast Forward tool was applied. There may be a difference in the model time shown in the simulation performance report and the current model time shown in the index under the net overview. For more information about IID values, see Calculating statistics. Note that if confidence intervals are included in simulation performance reports, then it is important to understand that the confidence interval for a particular data collector will not be accurate if the data values for the data collector are not independent and identically distributed (IID). These options are found in the net overview in the index. The net-specific Simulation performance report options can be used to select which statistics should be included in simulation performance reports. Simulation performance reports are saved as HTML files, and are named PerfReport.html. A simulation performance report is saved in a simulation output directory immediately after the stop functions for monitors are invoked. A simulation performance report will be saved if the net contains data collector monitors. Simulation performance reports provide an overview of the statistics that are calculated during one simulation for the data collector monitors in a net. The last line of the excerpt indicates that the value 1 was the 8th value collected, and it was collected after step 11 at model time 532. Since the value was collected at step 0, it must have been the value returned by the initialization function for the monitor. The second line of the excerpt indicates that the value 0 was the first value collected, it was collected at step 0 and model time 0. The first line of the excerpt is a comment indicating the meaning of the four columns. Here is an excerpt from a data collector log file. The fourth column indicates the model time at which the data values were collected. The third column indicates the simulation steps at which the data values were collected. The first column is the data values that are observed by the data collector. There are four columns of numbers in each data collector log file. Data collector log files are saved in simulation output directories.
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