to or at a source, origin, center, or the like: to follow a stream up to its source. 7. to or at a higher point or degree, as of rank, size, value, pitch, loudness, brightness, maturity, or speed: to move up in a firm; to pump up a tire; to turn a lantern up; Prices are going up.
What is 'Standard Deviation'. Standard deviation is a measure of the dispersion of a set of data from its mean. If the data points are further from the mean, there is higher deviation within the data set. Standard deviation is calculated as the square root of variance by determining the variation between each data point relative to the mean.
Definition of Standard Deviation. Standard deviation (Ï) is defined as the square root of the variance. It measures the variability about the mean of a data set: the closer to the mean, the lower the standard deviation.efinition of Standard Deviation. Standard deviation (Ï) is defined as the square root of the variance. It measures the variability about the mean of a data set: the closer to the mean, the lower the standard deviation.