How to efficiently calculate a running standard deviation?

Question

I have an array of lists of numbers, e.g.:

[0] (0.01, 0.01, 0.02, 0.04, 0.03) [1] (0.00, 0.02, 0.02, 0.03, 0.02) [2] (0.01, 0.02, 0.02, 0.03, 0.02)      ... [n] (0.01, 0.00, 0.01, 0.05, 0.03) 

What I would like to do is efficiently calculate the mean and standard deviation at each index of a list, across all array elements.

To do the mean, I have been looping through the array and summing the value at a given index of a list. At the end, I divide each value in my "averages list" by n (I am working with a population, not a sample from the population).

To do the standard deviation, I loop through again, now that I have the mean calculated.

I would like to avoid going through the array twice, once for the mean and then once for the SD (after I have a mean).

Is there an efficient method for calculating both values, only going through the array once? Any code in an interpreted language (e.g. Perl or Python) or pseudocode is fine.

Answer 1

The answer is to use Welford's algorithm, which is very clearly defined after the "naive methods" in:

• Wikipedia: Algorithms for calculating variance

It's more numerically stable than either the two-pass or online simple sum of squares collectors suggested in other responses. The stability only really matters when you have lots of values that are close to each other as they lead to what is known as "catastrophic cancellation" in the floating point literature.

You might also want to brush up on the difference between dividing by the number of samples (N) and N-1 in the variance calculation (squared deviation). Dividing by N-1 leads to an unbiased estimate of variance from the sample, whereas dividing by N on average underestimates variance (because it doesn't take into account the variance between the sample mean and the true mean).

I wrote two blog entries on the topic which go into more details, including how to delete previous values online:

• Computing Sample Mean and Variance Online in One Pass
• Deleting Values in Welford’s Algorithm for Online Mean and Variance

You can also take a look at my Java implement; the javadoc, source, and unit tests are all online:

• Javadoc: stats.OnlineNormalEstimator
• Source: stats.OnlineNormalEstimator.java
• JUnit Source: test.unit.stats.OnlineNormalEstimatorTest.java
• LingPipe Home Page

Answer 2

The basic answer is to accumulate the sum of both x (call it 'sum_x1') and x² (call it 'sum_x2') as you go. The value of the standard deviation is then:

stdev = sqrt((sum_x2 / n) - (mean * mean))  

where

mean = sum_x / n 

This is the sample standard deviation; you get the population standard deviation using 'n' instead of 'n - 1' as the divisor.

You may need to worry about the numerical stability of taking the difference between two large numbers if you are dealing with large samples. Go to the external references in other answers (Wikipedia, etc) for more information.