How to Label Only Every Nth Data Point in #Tableau The Formulas. Here are the four simple steps needed to do this: Create an integer parameter called [Nth label] Crete a calculated field called [Index] = index () Create a calculated field called [Keeper] = ( [Index]+ ( [Nth label]-1))% [Nth label] As shown in Figure 4, create a calculated field that holds the values you want to display.