> ## Documentation Index
> Fetch the complete documentation index at: https://doc.lucidworks.com/llms.txt
> Use this file to discover all available pages before exploring further.
# ttest
export const LwTemplate = ({title = "Key questions to get you started", icon = "sparkles", cta = "Powered by Agent Studio", linkHref = "https://lucidworks.com/demo/?utm_source=docs&utm_medium=referral&utm_campaign=docs_cta_ai"}) => {
const [isLoaded, setIsLoaded] = useState(false);
useEffect(() => {
const timer = setTimeout(() => {
setIsLoaded(true);
}, 500);
return () => clearTimeout(timer);
}, []);
return
{isLoaded && `
}} />}
Powered by Lucidworks Agent Studio
;
};
[localhost link]: http://localhost:3000/docs/4/fusion-server/reference/fusion-sql/ttest
[mintlify link]: https://doc.lucidworks.com/docs/4/fusion-server/reference/fusion-sql/ttest
[old doc.lw link]: https://doc.lucidworks.com/fusion-server/4.2/3259
The `ttest` function performs a two sided t-test on two random samples drawn from two queries. The `ttest` function takes four parameters:
1. the numeric field on which to perform the t-test
2. the query for drawing the first sample
3. the query for drawing the second sample
4. the sample size for both samples
## Sample syntax
```sql wrap theme={"dark"}
select ttest(sepal_width_d, "species_s:versicolor", "species_s:virginica", 150) as t,
p_value
from iris
```
## Result set
The result set for the ttest function contains one row with the results of the ttest. The ttest function returns the t statistic. The p\_value field can be selected to return the p-value for the ttest.
Sample result set in Apache Zeppelin:
## Visualization
Sample visualization of the ttest function using the Apache Zeppelin number visualization:
## Visualization
Sample visualization of the ttest function using the Apache Zeppelin number visualization:
