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There are two techniques used for operational testing to test the reliability of software: Steady state reliability estimation In this case, we use feedback from delivered software products. Depending on those results, we can predict the future reliability for the next version of product. This is similar to sample testing for physical products.
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Let's look at DirecTV (NAS: DTV) and three of its industry peers, to see how efficiently they use cash. Here are the ROIC figures for each company over a few periods. Here are the ROIC figures for ...
The environment should be constant throughout testing in order to provide accurate and reliable results. If the testing is a success, we should see a proportional change in performance. For example, if we double the users on the system, we should see a drop in performance of 50%. [6]
Hughes Electronics Corporation was formed in 1985 when Hughes Aircraft was sold by the Howard Hughes Medical Institute to General Motors for $5.2 billion. Surviving parts of Hughes Electronics are today known as DirecTV Group, while the automotive divisions became Aptiv.
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The name of this formula stems from the fact that is the twentieth formula discussed in Kuder and Richardson's seminal paper on test reliability. [1] It is a special case of Cronbach's α, computed for dichotomous scores. [2] [3] It is often claimed that a high KR-20 coefficient (e.g., > 0.90) indicates a homogeneous test. However, like ...