https://www.loom.com/share/7841056a2453411d86727c3ef15e6036?sharedAppSource=team_library

# The Basics

- The syntax for basic operations is the same as Excel:
`+`

, `-`

, `*`

, `/`

, `^`

.
- You can reference variables in formulas by typing the variable name and selecting it from the autocomplete dropdown.
- If you select a cell, you can see + edit its formula in the formula bar at the top of the spreadsheet
- If you double click on a cell, you can see + edit its formula in-line in the spreadsheet
- You can add comments to your formulas with a double slash
`//`

Everything between `//`

and the end of the line will be ignored by Causal
- Click on
**Show Formulas** in the top-left of the spreadsheet to see all the formulas in your model

# Time-series formulas

You'll often want variables to change over time.

## Examples

Here are some examples, with corresponding Causal formulas. The formulas are explained in the next section.

**Linear growth:** increasing a variable by an absolute value each month

```
**Customers** = **Customers**[previous] + **New Customers**
```