A common measure of the dispersion of a random variable or of a sample of data. Defined as the square root of the variance.

 The average difference of a set of scores from their mean; a measure of variability.

The square root of the variance. A measure of dispersion of a set of data from its mean.

A computed measure of vari- ability indicating the spread of the data set around the mean.

This statistical measurement of dispersion about an average, depicts how widely a mutual fund's returns varied over a certain period of time. Investors use the standard deviation of historical pe [..]

For traits having a normal distribution characterized by a bell shaped curve, 68% of the population = mean (average) ? 1 standard deviation, 95% = mean ? 2 standard deviations, and 99% = mean ? 3 standard deviations.

The most widely used measure of dispersion of a frequency distribution introduced by K. Pearson (1893). It is equal to the positive square root of the variance. The standard deviation should not be co [..]

The positive square root of the variance; a measure of dispersion in the same units as the original data.Related Terms: Dispersion 

A term used in statistical analysis. A measure of variation that indicates the typical distance between the scores of adistribution and the mean; it is determined by taking the square root of the aver [..]

A statistical term for measuring the expected degree of dispersion or variability among numbers in a group. For example, the standard deviation in the annual incomes of employees at a specific facto [..]

is a measure of how much individual scores in a data set differ from the mean. • calculated by taking the square root of the variance. The variance is the average of the squared differences from the m [..]

A measure of the amount of variation in the scores of a group of test takers. It is the average distance of the scores from the group mean score (but with the average distance computed by a procedure called "root-mean-square," which is a bit more complicated than the usual procedure). The standard deviation is expressed in the same units [..]

A statistical measure of price fluctuation. One use of the standard deviation is to measure how stock price movements are distributed about the mean. See also Volatility.

measure of variation in a set of data.

The standard deviation is how much a set of data is different from the curve it should make when plotted on a graph. Or, the square root of the average of the squares of deviations about the mean of a [..]

Standard deviation measures how much individual values in a group deviate from the average or mean score for the group. In other words, the value of standard deviation helps show how many subjects in the group score within a certain range from the mean score for the group. In financial markets it is used as a method of assessing how variable or vol [..]

Standard deviation is a statistical measurement of how far a variable quantity, such as the price of a stock, moves above or below its average value. The wider the range, which means the greater the standard deviation, the riskier an investment is considered to be.Some analysts use standard deviation to predict how a particular investment or portfo [..]

A measure of the dispersion of possible outcomes. Mathematically, the root mean square of variances of probability distribution.) [D02230]

A measure of the spread, scatter or variability of a set of measurements. Usually used with the mean (average) to describe numerical data.

The square root of the variance, and a common way to indicate just how different a particular measurement is from the mean. “An observation more than three standard deviations away from the mean can b [..]

The standard deviation of a set of numbers is the rms of the set of deviations between each element of the set and the mean of the set. See also sample standard deviation.

A measure of spread within a distribution (the square root of the variance). The most popular and most reliable measure of variability but the more skewed a distribution, the more error there will be [..]

A statistical term that provides a good indication of volatility. It measures how widely values (closing prices for instance) are dispersed from the average. The larger the difference between the clos [..]

A measure of the range of the data. The mean of all the means of all the sets of data. The square root of the variance. © 2014 Nature Education

A statistic that measures the dispersion of a sample.

Definition A statistical measure of the historical volatility of a mutual fund or portfolio, usually computed using 36 monthly returns. More generally, a measure of the extent to which numbers are spr [..]

The standard deviation measures the spread of the data about the mean value.

A statistical measure of the degree of variation from the mean value among the individual measurements in a series of values. standard error of the mean (SEM)

The square root of the variance. A measure of dispersion of a set of data from its mean.

a measure of dispersion in scores, whether they are narrowly or broadly dispersed around the mean.

The positive square root of the variance. This is the standard statistical measure of the spread of a sample.

In statistical analysis, a quantitative measure of how far a variable differs from the norm, calculated as the square root of the variance.

Standard Deviation is a measure of variation (or variability) that indicates the typical distance between the scores of a distribution and the mean. Looking at an example will help us make sense of th [..]

The square root of the sum of squared values of concentration minus centerline concentration. The cloud half-width can be defined as the distance corresponding to a concentration of two or three stand [..]

A measure of variability. The standard deviation quantifies how much the values vary from each other. A measure of the spread of individual observations around the mean value of the sample. A normal, unskewed curve will have 34% of the cases between the mean and one standard deviation above or below the mean; 68% of cases between one standard devia [..]

Statistical measure of the degree to which an individual value in a probability distribution tends to vary from the mean of the distribution.

Square root of the variance

used to describe the spread of the distribution of numbers. Standard deviation is calculated by the following steps.

The standard deviation is the square root of the variance.

A representation of the risk associated with a financial instrument (stocks, bonds, etc.) or a portfolio of investments. The larger the standard deviation in a given period, the greater implied risk. Risk is an important factor in determining how to efficiently manage investments and understanding the standard deviation gives investors a statistica [..]

A statistical index of variability that describes the spread

measure of how widely an investment or investment strategy’s returns move relative to its average returns for an observed period. A higher value implies more “risk”, in that there is more of a chance [..]

A measure of variability or dispersion of a set of data. The standard deviation (SD) is the square root of the variance. It is calculated based on the difference between each individual observation an [..]

A measure of variability of data. The standard deviation is the average of the deviations from the mean.

A measure of the dispersion of a set of scores. Specifically, it is the square root of the average squared deviation of scores about their arithmetic mean.

A measure of the dispersion of a set of scores. Specifically, it is the square root of the average squared deviation of scores about their arithmetic mean.

Standard deviation measures the spread of a data set. The greater the standard deviation, the greater the spread of the data. To calculate the standard deviation, find the differences between the actu [..]

A statistical measure of the distance a quantity is likely to lie from its average value. In finance, standard deviation is applied to the annual rate of return of an investment, to measure the invest [..]

A statistical measure of the variability of a set of observations.

Standard deviation is still the most widely used measure of dispersion, or in financial markets, risk.

The square root of the mean of the squares of the measured deviations from the mean value.

The standard deviation is a statistical measure that is used in finance in order to gauge risk. The standard deviation of period returns is used as a risk measure. If the standard deviation is high, t [..]

Standard deviation is a measure of risk, and quantifies the dispersion of the data from its mean; the square root of variance.

Metric for measuring the spread in a data set (see also FinanceIsland's basic statistics tutorial

Standard deviation (the square root of the variance) is a statistical measure of the spread of a set of numbers. A set of numbers distributed on a standard bell shaped curve would have a standard devi [..]

A statistical term describing the variations from the average, it measures a fund or portfolio's historical volatility by looking at past returns. The higher the standard deviation, the greater the potential for volatility.

an estimate of the variability of a set of measurements about the mean value; it is calculated by computing the square root of the variance.

The standard deviation is a measure of the amount of variation within a data set. If all values in a data set are very close together, the standard deviation will be close to zero. In such cases, the [..]

As it pertains to this website, a statistical measure of how widely dispersed the individual test results were from the published average ultimate loads.

A measure of dispersion around the mean value of a population. Frequently denoted by sigma. It is the square root of the variance.

The volatility of returns, or the average deviation from an expected value or mean.

The square root of variance, standard deviation, measures the spread or dispersion around the mean of a data set. It is the most widely-used measure of spread.

A measure of dispersion within a set of data, calculated from the square root of the variance, to give a value in the same range as raw scores. The standard deviation is the spread of scores around th [..]

in statistics, a measure of the variability of the distribution about a mean. A small standard deviation figure would indicate that most results cluster about the mean, whereas a higher score would in [..]

Standard deviation is a measure of variability in student performances. Approximately 68 per cent of student results are expected to fall between minus one and plus one standard deviation around the mean.

A statistic that describes how much the scores in a particular group vary; it is a measure of variability. Conceptually, the number indicates the average amount by which the scores in a group differ from their mean score. It is also the square root of the variance.

The statistical measure of dispersion of estimates for the fiscal period indicated. The standard deviation is the average variance from the mean expressed in local currency.

Measures the dispersion of a set of data from its average. The higher the standard deviation the wider the spread of data. For investment returns, a higher standard deviation indicates a wider range o [..]

Standard deviation, or volatility, is an indicator of the risk associated with an investment fund. The higher the standard deviation, the higher the inherent risk of the investment fund.

Approximately, the mean difference between all of the data points in a sample and their average. Formally the square root of the variance (V), where

A descriptive statistic for characterizing variability that is based on deviations from the arithmetic mean.

A measurement of the scatter or several sample values around their average.

A measure of the spread or dispersion of data.

A statistical measure of the degree to which an individual value in a probability distribution tends to vary from the mean of the distribution.

A measure of risk, deriving from the historic volatility of a particular asset.

A measure of historical volatility. It is calculated by comparing the average (or mean) return with the average variance from that return.

A very common measure of spread useful for symmetrical distributions and ratio data.

A measure of historical volatility. It is calculated by comparing the average (or mean) return with the average variance from that return.

A measure of dispersion that indicates the way the returns are centered about the mean return.

A measure of the amount of scatter of a group of replicate measurements around the mean value. The larger the standard deviation, the more scattered the individual measurements are around the mean value. A larger standard deviation also means that the precision of the set of measurements is lower (worse), and the accuracy of the overall measurement [..]

The standard deviation is a statistical measure describing the variability in a distribution of scores. The more the scores cluster around the mean, the smaller the standard deviation. In a normal dis [..]

A measure of the dispersion of random errors about the mean value. If a large numberof measurements or observations of the same quantity are made, the standard deviation is the square root of the sum [..]

A statistical measure of the month-to-month ups and downs of securities returns. Money-market securities, which have stable asset values, have standard deviations of zero. Volatile, aggressive-growth [..]

A measure of a rollout

A measure of the amount of scatter of a group of replicate measurements around the mean value. The larger the standard deviation, the more scattered the individual measurements are around the mean value. A larger standard deviation also means that the precision of the set of measurements is lower (worse), and the accuracy of the overall measurement [..]

A statistical measure of the average volatility of a security's returns in relation to its average value. Money-market securities, which generally have stable asset values, have standard deviations of zero. More volatile, aggressive-growth portfolios usually have a higher percentage of deviation. Standard deviation gives the investor an idea o [..]

A standard deviation tells us how much specific examples vary from the average in a particular set. Thus, the larger the standard deviation, the more diverse/volatile are the examples. The more volati [..]

A measure of the spread or dispersion of a set of observations, calculated as the average difference from the mean value in the sample.

The most widely used measure of dispersion of a frequency distribution, equal to the positive square root of the variance.

A common measure of spread in the distribution of a random variable.

The square root of the variance.

Standard deviation is a measure of the spread or dispersion of a set of data. It is calculated by taking the square root of the variance. The more widely the values are spread out, the larger the stan [..]

is a measure of dispersion used to describe a sample of a numerical variable. The SD is the average deviation of the observations from the mean (see also mean). Since it is based on the mean, it can only be used in a meaningful way when the underlying distribution is symmetrical.

The square root of the sum of the squared deviations from the mean, divided by the number of observations minus one.

A measure of the average distance of a set of data points from their mean. A set of data points that are all close to their mean will have a smaller standard deviation than a set of points that are further from their mean.

a measure of a mutual fund or stock’s historical volatility.

Standard deviation measures the average variability of the fund's returns over a time period. Stable investments like money market funds have standard deviation near zero, while high-risk equity funds often have a much higher one. A standard deviation of 10 means approximately 68% of the time a fund will be within 10% of its mean (average) [..]

In a normal distribution, a measure of how the events are distributed. A low standard deviation indicates that a large number of the events are concentrated near the middle of the distribution. A high standard deviation indicates that more of the events fall near the tails of the distribution.

Indicates a mutual fund or a stock’s unpredictability (based on historical performance).

The statistical measure of dispersion of estimates for the fiscal period indicated. The standard deviation is the average variance from the mean expressed in local currency.

(statistics) A measure of how spread out data values are around the mean, defined as the square root of the variance. Represented with the Greek letter mul|?|pos=sigma.

A measure of the spread or dispersion of a set of observations, calculated as the average difference from the mean value in the sample.

The standard deviation (this term was first used by Pearson, 1894) is a commonly-used measure of variation. The standard deviation of a population of values is computed as:

The square root of the variance. A measure of dispersion of a set of data from its mean.