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Standard Deviation Calculator. Standard Deviation (SD) is the measure of spread of the numbers in a set of data from its mean value. It is also called as SD and is represented using the symbol Ï (sigma). This can also be said as a measure of variability or volatility in the given set of data. Find the mean, variance and SD of the given numbers using this free arithmetic standard deviation calculator online. Enter an 'n' number of values in the calculator and find the SD (Ï), mean and variance. Standard Deviation Calculator Enter all the numbers separated by comma ','.
Standard deviation (SD). This describes the spread of values in the sample. The sample standard deviation, s, is a random quantity -- it varies from sample to sample -- but it stays the same on average when the sample size increases. Standard error of the mean (SE). This is the standard deviation of the sample mean, , and describes its accuracy as an estimate of the population mean, . When the sample size increases, the estimator is based on more information and becomes more accurate, so its standard error decreases.