SAS Forecast Server should use the length of the series when determining the maximum holdout from the maximum holdout-percentage. However, SAS Forecast Server uses one less than the length of the series.

There are no errors or warnings.

The workaround is to increase the maximum holdout-percentage by one. The workaround offsets the issue in the vast majority of cases.

The maximum holdout-percentage is represented by the following variables and check box:

• HOLDOUTPCT in SAS Forecast Server Procedures code
• HOLDOUTPCT in SAS Forecast Server batch macros, that is, %FSCREATE and %FSUPDATE
• "Maximum percentage of series that holdout sample can be" in SAS Forecast Studio

The holdout that you specify is compared to this calculation:

If this calculation is greater than the holdout that you specify, then the maximum holdout-percentage does not affect the determination of the effective holdout.

If the maximum holdout-percentage does affect the determination of the effective holdout, then the effective holdout might or might not differ from what the effective holdout should be.

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