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Exponent, Inc. is an American engineering and scientific consulting firm. Exponent has a multidisciplinary team of scientists, physicians, engineers, and business ...
In survival analysis, the hazard ratio (HR) is the ratio of the hazard rates corresponding to the conditions characterised by two distinct levels of a treatment variable of interest. For example, in a clinical study of a drug, the treated population may die at twice the rate of the control population.
Exponentiation is when a number b, the base, is raised to a certain power y, the exponent, to give a value x; this is denoted =. For example, raising 2 to the power of 3 gives 8: = The logarithm of base b is the inverse operation, that provides the output y from the input x.
Exponentiation with negative exponents is defined by the following identity, which holds for any integer n and nonzero b: =. [1] Raising 0 to a negative exponent is undefined but, in some circumstances, it may be interpreted as infinity (). [22]
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etr – exponent of the trace. exc – excosecant function. (Also written as excsc, excosec.) excosec – excosecant function. (Also written as excsc, exc.) excsc – excosecant function. (Also written as excosec, exc.) exs – exsecant function. (Also written as exsec.) exsec – exsecant function. (Also written as exs.) exp – exponential ...
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