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To find the geometric mean, transform the raw times to log times (using the Excel function =LN()), find the arithmetic mean of these log times, then convert this mean of the logs back into the original scale (using the Excel function =EXP()).
Jeff Sauro • Quantifying the User Experience: Practical Statistics for User Research
经过2个小时的研究，我们终于TMD知道什么是@ShanghaoJin 大佬提到的Gamma Exposure（GEX）
首先，从科学的角度来讲，我认为这就是完完全全的名词误用。他其实根本不是Gamma Exposure，他其实是在计算Option的Delta，也就是对Gamma进行积分。这就是为什么在计算中，要将Gamma乘以正股（如SPY）价格。更进一步说，实际上它就连Delta也不算，因为单位不对。下面我们会知道，它其实是在算机构对正股每1%价格移动下的Delta Hedge，这个单位是美元
其次，这也解释了为什么在所谓Gamma Exposure中 ，Put前面是负数，Ca... See more
Poisson probability mass function is written: PrðX ¼ x; λÞ ¼ λx e−λ x! x ¼ 0; 1; 2;::: ð11:1Þ where λ is the mean number of occurrences in a given period of time, x is the number of occurrences we are interested in, and e is the natural logarithm constant (approximately 2.718),
Therese M. Donovan • Bayesian Statistics for Beginners: a step-by-step approach
what if you could map feature interpolation in media to curves and establish relationships between different features in latent space?
as you increase time, the rate of growth increases https://t.co/mdyIeYeWrF
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