Variability Basics - Variability and Randomness
4 important questions on Variability Basics - Variability and Randomness
Explain (with respect to managing a factory) the differences between a robust policy and a optimal policy.
A robust policy is one that works well most of the time. An optimal policy is the best policy for a specific set of conditions.
"Quality of non uniformity of a class of entities" is the definition of what?
Variability
Name at least 4 examples where variability can occur in manufacturing systems.
- process times
- machine failures / repair times
- quality measures
- setup times
- physical dimensions
- (operating) temperatures
- material hardness
- etc.
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Is it possible for variation to be a mix of random and controllable variation when considering only a single attribute of manufacturing systems, or are they always separated?
They can occur at the same time. For example process times are dependent on the machines or operators used (controllable in some form), but also on the failure rate of those machines (random).
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