FIXED is the first of three LOD calculations we will study in this chapter. It is used to make a calculation regardless of any dimension or measure filters that are applied in the workbook. The syntax of FIXED is the following: {FIXED [dim1[, dim2]…] : aggregate-expression}, with [dim1[, dim2]…] a list of dimensions along which the aggregation is to be calculated. 

For instance, let's look at the date of first order for a given customer. While a MIN([Date]) calculation will give the first date in the filtered dataset with Customer Name used as a row or column, {FIXED [Customer ID] :MIN([Date])} will give the first date for a customer in the entire dataset, filters notwithstanding, for each Customer ID. As a result, if we look at orders in 2013 in the Global Superstore dataset, we notice that the First Order Date can be in 2011:

Let's now take a look at how this will be affected by the order of operations.