Accuracy Summaries

If you are extrapolating from 3 separate solutions (see the Solution method choice on the Sim Overview page), the LOG file for each simulation in each run contains information about the accuracy of the solution. In particular it contains estimates as to how many results are accurate to how many figures.

If you select Accuracy Summary from the left-hand list box in the Results for Individual Years part of the Results page and then click on the View button there, you will see this Accuracy Summary in graphical form.

•If there is just one subinterval (see the Solution method), the summary will show you information about the accuracy of the whole simulation. The Variables and Data tabs let you look at the accuracy of these two aspects separately. You can see how many are accurate to the different numbers of figures (0 to 6).

•If there are several subintervals or you have used automatic accuracy, you can see accuracy summaries for the different subintervals.

oIf your model EXE file (as selected via the Change Model button on the Model/Data page) is from Release 8 or later of GEMPACK, one of these labelled Overall Accuracy Summary shows the accuracy of the whole simulation.

oBut if your model EXE file is from Release 7 or earlier of GEMPACK, none of these summaries shows the accuracy of the whole simulation. In this case it is the worst one which gives you some idea of the accuracy of the whole simulation.

If you click on the Accuracy button in the Results for All/Some Years part of the Results page, you will see a single accuracy estimate for each year of each run (Base, Rerun and Policy).

Several years are shown at once. You can see the different years by using the scroll bar.

•If you click on any one of the faces or numbers, you will see the details for this year of the relevant run. [What you see is the same as if you had selected Accuracy Summary in the Results for Individual Years part and then clicked on the View button there.]

•If there is just one subinterval (see the Solution method), the face or number will indicate the accuracy of the whole simulation. The Variables and Data tabs let you look at the overall accuracy of these two aspects separately.

•If there are several subintervals or you have used automatic accuracy, what you see depends on the Release of GEMPACK your model EXE was made with.

oIf your model EXE file (as selected via the Change Model button on the Model/Data page) is from Release 8 or later of GEMPACK, the face or number you see is based on the one of these labelled Overall Accuracy Summary and shows the accuracy of the whole simulation. In this case there is only accuracy information available for Variables -- none for Data since that is not shown in the LOG file.

oBut if your model EXE file is from Release 7 or earlier of GEMPACK, an Overall Accuracy Summary is not available. In this case the face or number you see is based on the worst subinterval (for Variables or Data depending on which tab is selected). This worst gives you some idea of the accuracy of the whole simulation.

oIn either case, if you click on the face or number you will be able to see the details for each subinterval (not just the Overall Accuracy Summary or the worst subinterval) for this year of the relevant run.

The faces or numbers shown are based entirely on the are judged accurate to xx figures parts of the relevant Accuracy Summary shown in the relevant LOG file. They are not based on the different codes (for example, CX Confidence in the extrapolated result). Those in the Variables case are based on the levels results part of the (Extrapolating) Accuracy Summary, not on the results for the linearised variables. If two or more data files are updated, those in the Data case are based on the NEXT SUMMARY IS FOR ALL UPDATED DATA accuracy Summary.

If these accuracy summaries show numbers, note that these are in the range 0 to 10, where 10 is the most accurate and 0 is the least accurate.

The Accuracy Summary information shown by RunDynam is taken from the LOG file for the simulation for the relevant year and run. Hence Accuracy Summary information is not available if the LOG file is not present.

For more details about accuracy, you should consult the GEMPACK documentation.

URL of this topic: www.copsmodels.com/webhelp/rundynam/hc_accuracysummaries.htm

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