Hi everybody,

I’m trying to use the questHandler with the stopInterval termination rules. I read the doc of the QuestHandler class but I can’t understand what does it mean :

stopInterval: None or a number

The minimum 5-95% confidence interval required in the threshold estimate before stopping. If both this and nTrials is specified, whichever happens first will determine when Quest will stop.

In my current test I have images with a level of noise between 0 and 1 and I use the QuestHandler object like this :

```
staircase = data.QuestHandler(0.5, 0.5, pThreshold=0.51, stopInterval=0.01, delta=0.01, beta=3.5, gamma=0.1, minVal=0.0025, maxVal=1, nTrials=30)
```

In this line I choose `stopInterval`

randomly and it stop in 30 trials. I don’t now how to calculate the correct value in order to have a 95% confidence level.

I also checked the code of the questHandler class and I saw that they compare the result of the `confInterval()`

function and the value of `stopInterval`

. The experience stop if `confInterval() < stopInterval`

.

So I print my values of `confInterval()`

during my experience and the values are between 0.22 at the beginning and 0.13 after 30 trials.

Do you have any ideas how to calculate stopInterval in order to have a 95% confidence level?