Logistic

The Logistic reliability growth model has an S-shaped curve and is given by [3]:

(1)

where b and k are parameters. Similar to the analysis given for the Gompertz curve, the following may be concluded:

1. The point of inflection is given by:

   (2)

2. When b > 1 then Ti > 0 and an S-shaped curve will be generated. However, when then and the Logistic reliability growth model will not be described by an S-shaped curve.

3. The value of R is equal to 0.5 at the inflection point.

This chapter includes the following sections:

• Parameter Estimation for the Logistic Model

• Confidence Bounds for the Logistic Model

• General Examples Using the Logistic Model

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