What is VAR.S function in Excel? VAR.S function is one of Statistical functions in Microsoft Excel that estimates variance based on a sample (ignores logical values and text in the sample). Syntax of VAR.S function VAR.S(number1,[number2],…) The VAR.S function syntax has the following arguments: Number1 Required. The first number argument corresponding to a sample of a population. Number2, … Optional. Number arguments 2…