In 41 patients, all hyperfunctioning parathyroid tissue was resected at the time of surgery and confirmed by a corresponding decrease in the intraoperative postexcision rapid PTH determination as well as by subsequent normalization of postoperative serum calcium and PTH levels and resolution of clinical symptoms.
In other words, the standard deviation Ï (sigma) is the square root of the variance of X; i.e., it is the square root of the average value of (X â Î¼) 2. The standard deviation of a (univariate) probability distribution is the same as that of a random variable having that distribution.
For a Discrete random variable, the variance Ï2 is calculated as: For a Continuous random variable, the variance Ï2 is calculated as: In both cases f(x) is the probability density function. The Standard Deviation Ï in both cases can be found by taking the square root of the variance.or a Discrete random variable, the variance Ï2 is calculated as: For a Continuous random variable, the variance Ï2 is calculated as: In both cases f(x) is the probability density function. The Standard Deviation Ï in both cases can be found by taking the square root of the variance.