Lloyd Lipow

Lloyd and Lipow (1962) considered a situation in which a test program is conducted in N stages. Each stage consists of a certain number of trials of an item undergoing testing and the data set is recorded as successes or failures. All tests in a given stage of testing involve similar items. The results of each stage of testing are used to improve the item for further testing in the next stage. For the kth group of data, taken in chronological order, there are nk tests with Sk observed successes. The reliability growth function is then [6]:

(1)

where:

Note that essentially, ]. If the data set consists of reliability data, then Sk is assumed to be the observed reliability given and nk is considered 1.

This chapter includes the following sections:

Parameter Estimation for the Lloyd Lipow Model
Confidence Bounds for the Lloyd Lipow Model
General Examples Using the Lloyd Lipow Model

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