This article describes how to fit a spline and compute a simultaneous confidence interval.

## Requirements

You will need:

- A
**Date/Time**structure variable. - At least one
**Numeric**structure variable.

## Method

- Select
**Anything > Advanced Analytics > Test > Spline with Simultaneous Confidence Interval**. - For
**Outcome**, select a numeric structure variable - For
**Predictor**, select a Date/Time structure variable - For
**Regression type**- Select the Regression type you want to use:**Binary Logit -**this is the default.**Linear**

- For
**Confidence interval %**- the default is 95 - For
**Draws to show**- the default is 30 - For
**Random seed**- the default is 12321

## Next

How to create a time series graph