# What is statistical significance?

Statistical significance is a mathematical method to determine if a result is genuine or the result of random chance. Thematic will highlight some difference in theme volume as statistically significant to help you identify more insightful changes.

Thematic will mark a difference as statistically significant if there is a 5% or less chance the difference is because of randomness. This means the difference can be considered genuine and not because of random chance.

### Examples of statistical significance

The difference in 'leg room' mentions in 4+ star reviews and 1-3 star reviews is not statistically significant. This means the difference may be caused by random chance and not a genuine difference. The difference in 'missed flight' mentions between 4+ star reviews and 1-3 star reviews is statistically significant. This means the difference can be reliably assumed as genuine and not because of random chance. ### Calculation method

Thematic uses two-tailed test to calculate volume differences. 