# Standard deviation in investment ## What is standard deviation in investing?

Description. Standard deviation is the statistical measure of market volatility, measuring how widely prices are dispersed from the average price. If prices trade in a narrow trading range, the standard deviation will return a low value that indicates low volatility.

## How do you calculate the standard deviation of an investment?

The standard deviation can be found by taking the square root of the variance. Therefore, the portfolio standard deviation is 16.6% (√(0.5²*0.06 + 0.5²*0.05 + 2*0.5*0.5*0.4*0.0224*0.0245)). Standard deviation is calculated, much like expected return, to judge the realized performance of a portfolio manager.

## What is a good standard deviation for a mutual fund?

The greater the standard deviation, the greater the range in what is being measured. If a fund has an average return of 4 percent and a standard deviation of 7, its past returns have ranged from -3 percent to 10 percent. The same fund with a standard deviation of 2 has a return range of 2 to 6 percent.

## What is standard deviation in risk?

The standard deviation is often used by investors to measure the risk of a stock or a stock portfolio. The basic idea is that the standard deviation is a measure of volatility: the more a stock’s returns vary from the stock’s average return, the more volatile the stock.

## What does a standard deviation of 1 mean?

A normal distribution with a mean of 0 and a standard deviation of 1 is called a standard normal distribution. … Since the distribution has a mean of 0 and a standard deviation of 1, the Z column is equal to the number of standard deviations below (or above) the mean.

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## When should I use standard deviation?

The standard deviation is used in conjunction with the mean to summarise continuous data, not categorical data. In addition, the standard deviation, like the mean, is normally only appropriate when the continuous data is not significantly skewed or has outliers.

## Is volatility a standard deviation?

Standard deviation is also a measure of volatility. Generally speaking, dispersion is the difference between the actual value and the average value. The larger this dispersion or variability is, the higher the standard deviation.

## How do you interpret standard deviation?

More precisely, it is a measure of the average distance between the values of the data in the set and the mean. A low standard deviation indicates that the data points tend to be very close to the mean; a high standard deviation indicates that the data points are spread out over a large range of values.

## Is it better to have a higher standard deviation?

Standard deviation is a mathematical tool to help us assess how far the values are spread above and below the mean. A high standard deviation shows that the data is widely spread (less reliable) and a low standard deviation shows that the data are clustered closely around the mean (more reliable).

## What is the difference between standard deviation and variance?

Key Takeaways. Standard deviation looks at how spread out a group of numbers is from the mean, by looking at the square root of the variance. The variance measures the average degree to which each point differs from the mean—the average of all data points.