group_throttle

Reduce the number of groups in multilevel BLUE using a throttle

Specification

• Alias: None

• Arguments: None

Child Keywords:

Required/Optional	Description of Group	Dakota Keyword	Dakota Keyword Description
Required (Choose One)	Throttle Approach	mfmc_groups	Throttle multilevel BLUE to only search over MFMC groups
		common_groups	Throttle multilevel BLUE to only search over common groups
		group_size	Throttle multilevel BLUE to only search over groups of a maximum size
		best_conditioned	Throttle multilevel BLUE to only solve for allocations using the groups with the best conditioning in their group covariances
		rcond_tolerance	Throttle multilevel BLUE to only solve for allocations using groups with prescribed conditioning in their group covariances

Description

The number of groups in ML BLUE is, by default, determined by all combinations of the model indices, spanning the truth model and all approximations. This combinatorial growth quickly results in very large group counts as the number of model approximations grows. This number of combinations may be optionally throttled using one of the following schemes: mfmc_groups, common_groups, group_size, best_conditioned, or rcond_tolerance.

Default Behavior

The default is no throttle: all model combinations are included.