Minimum Data Requirements - Times-to-Failure Data

The minimum data requirements for analysis of developmental times-to-failure data are presented next.

Data Type	Minimum Requirements	Models
Developmental Data
Times-to-Failure Data
Failure Times	At least 3 unique failures.	Crow-AMSAA, Duane
		Crow Extended: BD modes - at least 3 unique BD modes - at least 3 unique
Grouped Failure Times	At least 3 unique failures.	Crow-AMSAA, Duane
		Crow Extended: BD modes - at least 3 unique BD modes - at least 3 unique
Multiple Systems - Known Operating Times	At least 3 unique failures for overall analysis.	Crow-AMSAA, Duane
		Crow Extended: BD modes - at least 3 unique BD modes - at least 3 unique
Multiple Systems - Concurrent Operating Times	At least 3 total failures for overall analysis.	Crow-AMSAA, Duane
	At least 3 unique failures on an individual system to return individual system results.	Crow Extended: BD modes - at least 3 unique BD modes - at least 3 unique
Multiple Systems with Dates	At least 3 total failures for overall analysis.	Crow-AMSAA, Duane
	At least 3 unique failures on an individual system to return individual system results.	Crow Extended: BD modes - at least 3 unique BD modes - at least 3 unique
Multiple Systems with Event Codes	At least 3 total failures for overall analysis. At least 3 unique failures on an individual system to return individual system results.	Crow Extended: BD modes - at least 3 unique BC modes - at least 3 unique I events apply only to BC modes and there must be an I event for each BC mode