I just had this problem myself. A simple solution, not 'the solution' (as i believe you can pay for this function to be added to excel), is as follows: (NB. This can be checked with reference to the GEOMEAN function).
e.g. your data is in column A (A3-A33)
in cell B3 type =LN(A3) (i.e. the natural log)
copy and paste down to B33.
In B34, calculate the standard deviation of the loged numbers i.e. =STDEV(B3:B33)
In A34 type =EXP(B34) This is your geometric standard deviation!!
You can check this method with ref. to the GEOMEAN function.
Take the mean of column B. i.e. in cell B35 type =average(B3:B33)
In cell A34 type =EXP(B34).
This should returen the same answer as =GEOMEAN(A3:A33)
There is an error in the above mentioned function which is:
//In B34, calculate the standard deviation of the loged numbers i.e. =STDEV(B3:B33)
Here do not calculate the STDEV(b3:b33) instead, calculate the =AVG(b3:b33)
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To calculate the standard deviation of a portfolio in Excel, you can use the STDEV.P function. This function calculates the standard deviation based on the entire population of data points in your portfolio. Simply input the range of values representing the returns of your portfolio into the function to get the standard deviation.
Use the STDEV() function.
=stdev(...) will return the N-1 weighted sample standard deviation. =stdevp(...) will return the N weighted population standard deviation.
Here's how you do it in Excel: use the function =STDEV(<range with data>). That function calculates standard deviation for a sample.
A worked out example is shown in the related link. There are a number of calculators that do this automatically. Also, the Excel program (and most other spreadsheet programs) include a standard deviation function. In Excel, it is +stdev(a1:a10) for a list of numbers from a1 to a10.
See the related links on how to calculate standard deviation. If there are more than a dozen data points, it is tedious to calculate by hand. Use excel or an online calculator. To get 2 standard deviations, multiply the calculated std deviation by 2.
Putting the data into excel, the std dev for the sample is 6.20
To calculate the portfolio standard deviation in Excel, you can use the formula SQRT(SUMPRODUCT(COVARIANCE MATRIX, WEIGHTS MATRIX, TRANSPOSE(WEIGHTS MATRIX))). This formula multiplies the covariance matrix of the assets, the weights of each asset in the portfolio, and the transpose of the weights matrix, then takes the square root of the sum of these products.
To calculate portfolio standard deviation in Excel, you can use the formula SQRT(SUMPRODUCT(COVARIANCEMATRIX, TRANSPOSE(WEIGHTS), WEIGHTS)), where COVARIANCEMATRIX is the range of covariance values, and WEIGHTS is the range of weights assigned to each asset in the portfolio. This formula takes into account the covariance between assets and their respective weights to determine the overall risk of the portfolio.
The order in which Excel will perform calculations.
yes you can do math in excel, it is very easy.
The main reason for Excel is to perform calculations.