What is standard deviation?

Standard deviation demonstrates the variation of a range of data, and can help determine statistical confidence.

Standard deviation in your SurveyVitals reporting shows how much more or less your data varies from the mean of the data you are comparing against. The further away the standard deviation is from “0,” the more your score varies from the mean.

A bell curve is a way to visualize standard deviation. The graphic below shows a data set with normal distribution. The peak of the curve is the mean, and on either side, as the data strays further from the average, there are fewer occurrences.

Where can I find my standard deviation score?

You can find your standard deviation score for individual questions or for a question group using the Report Builder in your portal.

Standard deviation for individual questions

After running a report using the Report Builder, scroll down to any survey question and click the 'Show Table' link in the lower right corner, underneath the answer distribution graph.

An answer distribution heat map will display in place of the graph. Immediately to the right of the heat map, your standard deviation score for that question will display above the 'S.D.' abbreviation. (In the example below, the standard deviation score is 0.52.)

Standard deviation for question groups

After running a report using the Report Builder, scroll down to the 'Question Groups Breakdown' section and click the 'Question Group Details' link below the graph.

Line graphs will display to show mean scores over time for each question group. Directly to the right of each line graph, your standard deviation score for that question will display below the 'S.D.' abbreviation. (In the example below, the standard deviation score for Scheduling is 0.66.)

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