MDX Calculated Member Check if Measure is Null

Josh,

So you want to create a count of a measure when it is not null.  To do so in MDX, you can do the following:

WITH Member [Measures].[Count of Non Null]
AS
IIF(ISEMPTY([Measures].[Might Be Null - Avg]), NULL, 1)

SELECT
   NON EMPTY
   {
       [Measures].[Might Be Null - Avg],
       [Measures].[Count of Non Null]
   } ON COLUMNS,
   NON EMPTY
   {
       [Dim Date].[Fiscal Quarter].[Fiscal Quarter].ALLMEMBERS
   } ON ROWS
FROM
   [MyCube]