# HistoricalOptions
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The parameters that define or describe the historical data that your auto-adjusting budget is based on.

## Contents
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 ** BudgetAdjustmentPeriod **   <a name="awscostmanagement-Type-budgets_HistoricalOptions-BudgetAdjustmentPeriod"></a>
The number of budget periods included in the moving-average calculation that determines your auto-adjusted budget amount. The maximum value depends on the `TimeUnit` granularity of the budget:  
+ For the `DAILY` granularity, the maximum value is `60`.
+ For the `MONTHLY` granularity, the maximum value is `12`.
+ For the `QUARTERLY` granularity, the maximum value is `4`.
+ For the `ANNUALLY` granularity, the maximum value is `1`.
Type: Integer  
Valid Range: Minimum value of 1. Maximum value of 60.  
Required: Yes

 ** LookBackAvailablePeriods **   <a name="awscostmanagement-Type-budgets_HistoricalOptions-LookBackAvailablePeriods"></a>
The integer that describes how many budget periods in your `BudgetAdjustmentPeriod` are included in the calculation of your current `BudgetLimit`. If the first budget period in your `BudgetAdjustmentPeriod` has no cost data, then that budget period isn’t included in the average that determines your budget limit.   
For example, if you set `BudgetAdjustmentPeriod` as `4` quarters, but your account had no cost data in the first quarter, then only the last three quarters are included in the calculation. In this scenario, `LookBackAvailablePeriods` returns `3`.   
You can’t set your own `LookBackAvailablePeriods`. The value is automatically calculated from the `BudgetAdjustmentPeriod` and your historical cost data.  
Type: Integer  
Valid Range: Minimum value of 1. Maximum value of 60.  
Required: No

## See Also
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For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/budgets-2016-10-20/HistoricalOptions) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/budgets-2016-10-20/HistoricalOptions) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/budgets-2016-10-20/HistoricalOptions)