text: Understanding formulas in searches
  The Formula Builder includes many types of operators, such as logical (if, then, else), math, date, and text string functions.
  You can create a formula from directly within a search. If you have the privilege that allows you to create or edit Worksheets, you can also create a formula within a Worksheet. Formulas in Worksheets act as derived columns, so that anyone who uses the Worksheet as a data source will see the formula as just another column.
  Adding a formula within a search works much the same way as adding a formula to a Worksheet. However, you will be able to edit the formula directly from within the Answer. If you add the Answer to a Liveboard and share it with the Edit privilege, other people can see the formula results, too. To make edits to the formula, they also need to have the Edit privilege on the underlying data.
  Add a formula to a search
  You can add a formula directly within a search. Some common reasons for using a formula in a search are to perform mathematical functions, check for and replace null values, or add if…then…else logic. -
  View or edit a formula in a search
  You can always go back and view or edit a formula that has been added to a search. Do this by selecting the edit icon next to its name in the Columns listing. -
  About aggregate formulas
  When working with formulas, it is useful to understand the difference between regular (or row-wise) formulas and aggregation formulas. -
  About conversion formulas
  Some formulas require the input to be of a particular data type. If you find that you want to pass a value to the function, but it is of the wrong data type, you can convert it using a conversion formula. -
  About date formulas
  Date formulas allow you to apply date related functions to your formulas. -
  About percent (simple number) calculations
  You can use simple number functions to perform useful percent calculations. -
  About conditional formulas (operators)
  Conditional formulas, or operators, allow you to applyif
  conditions in your formulas. -
  About nested formulas
  Nested formulas, or formula on formula, allow you to reference a formula within another formula. -
  About formula support for chasm trap schemas
  You can create a formula that involves aggregated measures coming from multiple fact tables of a chasm trap.
  Text formulas are also available. These are covered in the comprehensive Formula function reference, which provides brief descriptions and examples for all types of formulas. The articles in the list explain concepts and give step-by-step instructions of how to work with formulas, whereas the reference is a quick cheat sheet.