Financial Modeling Tutorials

- Excel Modeling
- Financial Functions in Excel
- Sensitivity Analysis in Excel
- Sensitivity Analysis
- Capital Budgeting Techniques
- Time Value of Money
- Future Value Formula
- Present Value Factor
- Perpetuity Formula
- Present Value vs Future Value
- Annuity vs Pension
- Present Value of an Annuity
- Doubling Time Formula
- Annuity Formula
- Present Value of an Annuity Formula
- Future Value of Annuity Due Formula
- Maturity Value
- Annuity vs Perpetuity
- Annuity vs Lump Sum
- Deferred Annuity Formula
- Internal Rate of Return (IRR)
- IRR Examples (Internal Rate of Return)
- NPV vs XNPV
- NPV vs IRR
- NPV Formula
- NPV Profile
- NPV Examples
- Advantages and Disadvantages of NPV
- Mutually Exclusive Projects
- PV vs NPV
- IRR vs ROI
- Break Even Point
- Break Even Analysis
- Breakeven Analysis Examples
- Break Even Chart
- Benefit Cost Ratio
- Payback Period & Discounted Payback Period
- Payback period Formula
- Discounted Payback Period Formula
- Payback Period Advantages and Disadvantages
- Profitability Index
- Feasibility Study Examples
- Cash Burn Rate
- Interest Formula
- Simple Interest
- Simple Interest vs Compound Interest
- Simple Interest Formula
- CAGR Formula (Compounded Annual Growth Rate)
- Growth Rate Formula
- Effective Interest Rate
- Loan Amortization Schedule
- Mortgage Formula
- Loan Principal Amount
- Interest Rate Formula
- Rate of Return Formula
- Effective Annual Rate
- Effective Annual Rate Formula (EAR)
- Compounding
- Compounding Formula
- Compound Interest
- Compound Interest Examples
- Daily Compound Interest
- Monthly Compound Interest Formula
- Discount Rate vs Interest Rate
- Discounting Formula
- Rule of 72
- Geometric Mean Return
- Geometric Mean vs Arithmetic Mean
- Real Rate of Return Formula
- Continuous compounding Formula
- Weighted average Formula
- Average Formula
- EWMA (Exponentially Weighted Moving Average)
- Average Rate of Return Formula
- Mean Formula
- Mean Examples
- Population Mean Formula
- Weighted Mean Formula
- Harmonic Mean Formula
- Median Formula in Statistics
- Range Formula
- Outlier Formula
- Decile Formula
- Midrange Formula
- Quartile Deviation
- Expected Value Formula
- Exponential Growth Formula
- Margin of Error Formula
- Decrease Percentage Formula
- Relative Change
- Percent Error Formula
- Holding Period Return Formula
- Cost Benefit Analysis
- Cost Benefit Analysis Examples
- Cost Volume Profit Analysis
- Opportunity Cost Formula
- Opportunity Cost Examples
- APR vs APY
- Mortgage APR vs Interest Rate
- Normal Distribution Formula
- Standard Normal Distribution Formula
- Normalization Formula
- Bell Curve
- T Distribution Formula
- Regression Formula
- Regression Analysis Formula
- Multiple Regression Formula
- Correlation Coefficient Formula
- Correlation Formula
- Correlation Examples
- Coefficient of Determination
- Population Variance Formula
- Covariance Formula
- Coefficient of Variation Formula
- Sample Standard Deviation Formula
- Relative Standard Deviation Formula
- Standard Deviation Formula
- Standard Deviation Examples
- Effect Size
- Sample Size Formula
- Volatility Formula
- Binomial Distribution Formula
- Multicollinearity
- Hypergeometric Distribution
- Exponential Distribution
- Central Limit Theorem
- Poisson Distribution
- Central Tendency
- Hypothesis Testing
- Gini Coefficient
- Quartile Formula
- P Value Formula
- Skewness Formula
- R Squared Formula
- Adjusted R Squared
- Regression vs ANOVA
- Z Test Formula
- Z Score Formula
- Z Test vs T Test
- F-Test Formula
- Quantitative Research
- Histogram Examples

Related Courses

## Standard Deviation Examples

The following standard deviation example provides an outline of the most common scenarios of deviations. Standard Deviation (SD) is a popular statistical tool which is represented by the Greek letter ‘σ’ and is used to measure the amount of variation or dispersion of a set of data values relative to its mean (average), thus interpret the reliability of the data. If the standard deviation is smaller than data points lies close to the mean value, thus shows reliability. But if the standard deviation is larger than data points spreads far from the mean. Each example of Standard Deviation states the topic, the relevant reasons, and additional comments as needed.

### Calculation of Standard Deviation

Standard deviation is the square root of variance which is calculated by determining the variation between the data points relative to their mean. Below is the standard deviation formula

Where,

*x*_{i }*=*Value of the i^{th}point in the data set- x = The mean value of the data set
- n = The number of data points in the data set

It helps statisticians, scientists, financial analysts, etc to measure the volatility and performance trends about a data set. Let’s understand the concept of standard deviation using some examples:

**Note:**

Remember there are no good or bad standard deviations; It is just a way to represent data. But generally, a comparison of SD with a similar data set is being done for better interpretation.

### Top 3 Examples of Standard Deviation

Let’s see some simple to advanced examples of the standard deviation to understand it better.

#### Standard Deviation Example #1

In the financial sector standard deviation is a measure of ‘risk’ that is used to calculate the volatility between markets, financial securities, commodities, etc. Lower standard deviation means lower risk and vice versa. Also, the risk is highly correlated with returns, i.e. with low risk comes lower returns.

E.g. Let’s say a financial analyst analyzing the returns of Google stock and wants to measure the risks on returns if investments are made in the particular stock. He collects the data of the historical returns of google for the last five years which are as follows:

**Calculation:**

Thus standard deviation (or risk) of Google’s stock is 16.41% for annual average returns of 16.5%.

##### Interpretation

**#1 – Comparison Analysis:**

Let’s say Doodle Inc has similar annual average returns of 16.5% and SD ( σ ) of 8.5%. i.e. with Doodle, you can earn similar yearly returns as with Google but with lesser risks or volatility.

4.9 (1,067 ratings)

Again let’s say Doodle Inc has annual average returns of 18% and SD ( σ ) 25%, we can surely say that Google is better investment as compared to Doddle because standard deviation of Doodle is very high as compared to the returns it provides while Google provides rather lower returns than Doodle but with very low exposure to risks.

**Note:**

Investors are risk-averse. They wanted to get compensated for taking higher risks.

**#2 – The Empirical Rule: **

States that for normal distributions, nearly all (99.7%) of the data falls within three standard deviations of the mean, 95% data fall within 2 SD and 68% fall within 1 SD.

In other words, we can say that 68% returns of Google fall within + 1 time the SD of mean or ( x + 1 σ) = (16.5 + 1 * 16.41) = (0.09 to 32.91%). i.e. 68% returns of an investor of Google can go low till 0.09% and can rise up to 32.91%.

#### Standard Deviation Example #2

John and his friend Paul arguing about the heights of their dogs to properly categorize them as per rules of a dog show where various dogs will compete with different heights based on categories. John and Paul decided to analyze the variability in heights of their dogs using the concept of standard deviation.

They have 5 dogs with all types of heights, so they noted their heights as given below:

The heights of the dogs are 300mm, 430mm, 170mm, 470mm, and 600mm.

**Calculation:**

**Step 1 : **Calculate the Mean:

Mean ( x ) = 300 + 430 + 170 + 470 + 600 / 5 = 394

The red line in the graph shows the average height of the dogs.

**Step 2: **Calculate the Variance:

Variance ( σ^2 ) = 8836 + 1296 + 50176 + 5776 + 42436 / 5 = 21704

**Step 3: **Calculate the Standard Deviation:

Standard Deviation (σ) = √ 21704 = 147

Now using empirical method we can analyze which heights are within one standard deviation of the mean:

The empirical rule says that 68% of heights fall within + 1 time the SD of mean or ( x + 1 σ ) = (394 + 1 * 147) = (247, 541). I.e. 68% of heights fluctuate between 247 and 541.

**Note:**

The theory of the Empirical Method applies only to data-sets which are normally distributed and appears like a bell-shaped curve.

#### Standard Deviation Example #3

Outliers can artificially inflate standard deviation, so identify them and remove them from the better analysis.

For example, 20 students of a mathematical class graded with an average 60% marks on a practice test. The teacher seems concerned with the poor results so she decides to calculate the std deviation of marks to check whether students scores far or close to mean marks.

As per the calculation of standard deviation, the std deviation is 22.26%, which he thinks is very high. Let’s examine the teachers’ concerns.

**Calculation:**

- Using an empirical concept he finds 95% of students marks fluctuates between ( x + 2 σ ) e.15.5% and 100%. I.e. few students are failing in the subject if passing marks are 30%.
- On closely analyzing the marks he found a very very low scoring student, roll n.6 who scored only 10%.
- Roll no. 6 is actually an outlier which disturbs the analysis by artificially inflating the std deviation and decreasing the overall mean.
- The teacher decides to remove roll no. 6 to re-analyze the performance of the class and found the following result:

**Calculation:**

- Again using empirical concept he finds 95% of students marks fluctuates between 36.50% and 80%. i.e. neither student is failing in the subject.
- However, the teacher has to put extra efforts to improve the ‘outlier’ Roll no. 6 because in real life a student cannot be removed where a teacher finds hope for improvements.

### Conclusion

In statistics, it informs how tightly various data points are clustered around the mean in a normally distributed set of data. If the data points are closely bunched near the mean, then the standard deviation will be a small figure and bell curve will be steeply shaped and vise-Versa.

The more popular statistical measures like mean (average) or median may mislead the user due to the presence of extreme data points, but standard deviation educates the user about how far the data point’s lies from the mean. Also, it is helpful in the comparative analysis of two different data sets if the averages are the same for both the data sets.

Hence they present a complete picture where basic mean can be misleading.

### Recommended Articles

This has been a guide Standard Deviation Examples. Here we discuss its formula and top 3 examples of standard deviation along with step by step calculations. You can learn more about accounting from the following articles –

- Realized Volatility Calculation
- Formula of Sample Standard Deviation
- Formula of Relative Standard Deviation
- Standard Deviation Excel Graph
- Calculation of Portfolio Standard Deviation

- 250+ Courses
- 40+ Projects
- 1000+ Hours
- Full Lifetime Access
- Certificate of Completion