OLAP Cube Calculation for Last Year Comparison on Week Day - MDX - mdx

Question

I want to compare actual sales values with sales values of last year. The difficulty in this comparison is the compliance of the week days and thereby of the leap-year.
Example on day level:
2016-02-04 (thursday): actual sales: 580,- last year sales: 1.008,-
comparison with
2015-02-05 (thursday): actual sales: 1.008,-
So i want to compare the same week days in the month and not only the same dates.
Example on month level:
2016: (leap-year)
01.02.2016 - 29.02.2019 (february 2016) actual Sales: 19.300,- : last year Sales value: 19.000,-
comparison with
2015: (no leap year)
02.02.2015 - 02.03.2015 (february 2015 on week day logic) actual sales value: 19.000,-
I want not only compare February 2016 with february 2015 rather exactly the week day sales values summed.
I tried to write this calculation with an date calculation dimension and it works but only on the day level. Name of the calculation dimension: Date Calculations Week Day name of the member: ComparisonWD
SCOPE (
[Date].[Year - Quarter - Month - Date].MEMBERS,
[Date].[Date].MEMBERS );
( [Date Calculations Week Day].[ComparisonWD].[Previous Year],
[Date Calculations Week Day].[AggregationWD].Members )
= ( [Date Calculations Week Day].[ComparisonWD].DefaultMember,
ParallelPeriod( [Date].[Year - Quarter - Month - Date].[Date],
364,
[Date].[Year - Quarter - Month - Date].CurrentMember ) );
END SCOPE;
Result 2015:
Result 2016:
It works on day level, but as you seen not on the month and not onthe year level.
How can I achieve this?

Answer 1

I got the solution:
Cube Calculation Code for this problem:
// ------------------------------------------------------------------------
//
// Comparison Week Day - Date.Calendar
//
// ------------------------------------------------------------------------
SCOPE (
[Date].[Year - Quarter - Month - Date].MEMBERS,
[Date].[Date].MEMBERS );
///////////////////////////////////////////////////////////////////////////////////////
( [Date Calculations Week Day].[ComparisonWD].[Previous Year],
[Date Calculations Week Day].[AggregationWD].Members )
= SUM({ParallelPeriod([Date].[Year - Quarter - Month - Date].[Date], 364, Descendants( [Date].[Year - Quarter - Month - Date].CurrentMember , [Date].[Year - Quarter - Month - Date].[Date]).item(0)) :
Parallelperiod ([Date].[Year - Quarter - Month - Date].[Date], 364, Descendants( [Date].[Year - Quarter - Month - Date].CurrentMember , [Date].[Year - Quarter - Month - Date].[Date]).item((Descendants( [Date].[Year - Quarter - Month - Date].CurrentMember , [Date].[Year - Quarter - Month - Date].[Date])).Count - 1))}, [Date Calculations Week Day].[ComparisonWD].DefaultMember );
END SCOPE;
SCOPE ([Date Calculations Week Day].[ComparisonWD].[Diff. Over Previous Year]);
THIS = IIF( IsEmpty( [Date Calculations Week Day].[ComparisonWD].DefaultMember )
OR IsEmpty( [Date Calculations Week Day].[ComparisonWD].[Previous Year] ),
NULL,
[Date Calculations Week Day].[ComparisonWD].DefaultMember
- [Date Calculations Week Day].[ComparisonWD].[Previous Year] );
NON_EMPTY_BEHAVIOR(THIS) = [Date Calculations Week Day].[ComparisonWD].DefaultMember;
FORE_COLOR(THIS) = IIF( [Date Calculations Week Day].[ComparisonWD].[Diff. Over Previous Year] < 0, 255, 0); // 255 = RED
END SCOPE;
SCOPE ([Date Calculations Week Day].[ComparisonWD].[Diff. % Over Previous Year]);
THIS = IIF( IsEmpty( [Date Calculations Week Day].[ComparisonWD].[Diff. Over Previous Year] )
OR IsEmpty( [Date Calculations Week Day].[ComparisonWD].[Previous Year] ),
NULL,
[Date Calculations Week Day].[ComparisonWD].[Diff. Over Previous Year]
/ [Date Calculations Week Day].[ComparisonWD].[Previous Year] );
NON_EMPTY_BEHAVIOR(THIS) = [Date Calculations Week Day].[ComparisonWD].DefaultMember;
FORMAT_STRING(THIS) = 'Percent';
FORE_COLOR(THIS) = IIF( [Date Calculations Week Day].[ComparisonWD].[Diff. % Over Previous Year] < 0, 255, 0); // 255 = RED
END SCOPE;
///////////////
// Tuple (All years, All Months) is the default number (keeps compatibility with OWC11)
( [Date].[Year].[All], [Date].[MonthYear].[All],
Except( [Date Calculations Week Day].[ComparisonWD].[ComparisonWD].MEMBERS, [Date Calculations Week Day].[ComparisonWD].DefaultMember ) ) = [Date Calculations Week Day].[ComparisonWD].DefaultMember;
Now with summed values on every level:
With this Date Calculations Week Day Dimension you can show for every Measure the Prev Year Values on Week day logic.

Answer 2

Not exactly answering the question but in the following context PARALLELPERIOD seems quite generic:
1.
At the Month level:
WITH
MEMBER [Measures].[PY Internet Sales Amount] AS
(
ParallelPeriod
(
[Date].[Calendar].[Calendar Year]
,1
,[Date].[Calendar].CurrentMember
)
,[Measures].[Internet Sales Amount]
)
SELECT
{
[Measures].[Internet Sales Amount]
,[Measures].[PY Internet Sales Amount]
} ON 0
,{
//[Date].[Calendar].[Date].&[20130101]:[Date].[Calendar].[Date].&[20130601]
[Date].[Calendar].[Month].[January 2012]:[Date].[Calendar].[Month].[December 2013]
} ON 1
FROM [Adventure Works];
Gives this:
2.
Changing to the Date level but leaving the PARALLELPERIOD calculation the same:
WITH
MEMBER [Measures].[PY Internet Sales Amount] AS
(
ParallelPeriod
(
[Date].[Calendar].[Calendar Year]
,1
,[Date].[Calendar].CurrentMember
)
,[Measures].[Internet Sales Amount]
)
SELECT
{
[Measures].[Internet Sales Amount]
,[Measures].[PY Internet Sales Amount]
} ON 0
,{
[Date].[Calendar].[Date].&[20130101]:[Date].[Calendar].[Date].&[20130601]
//[Date].[Calendar].[Month].[January 2012]:[Date].[Calendar].[Month].[December 2013]
} ON 1
FROM [Adventure Works];
Gives these results (no NULLS):

Answer 3

Just tried to imitate the problem as a mdx query in ssms and it works. How can i apply on my cube calculation:
with
set [DateRange] as ( { ParallelPeriod([Date].[Year - Quarter - Month - Date].[Date],
364,
Descendants( [Date].[Year - Quarter - Month - Date].[Year].&[2013] , [Date].[Year - Quarter - Month - Date].[Date]).item(0)
) :
Parallelperiod ([Date].[Year - Quarter - Month - Date].[Date],
364,
Descendants( [Date].[Year - Quarter - Month - Date].[Year].&[2013] , [Date].[Year - Quarter - Month - Date].[Date]).item((Descendants(
[Date].[Year - Quarter - Month - Date].[Year].&[2013] , [Date].[Year - Quarter - Month - Date].[Date])).Count - 1))})
Select {
[Measures].[Turnover]
} on Columns,
non empty
(
[DateRange]
) on Rows
from [Sales Cube]
Following result:
Turnover Net
03.01.2012 642
04.01.2012 665
05.01.2012 633
06.01.2012 730
07.01.2012 761
08.01.2012 531
09.01.2012 422
10.01.2012 488
11.01.2012 518
.
.
.
23.12.2012 618
24.12.2012 174
25.12.2012 137
26.12.2012 536
27.12.2012 981
28.12.2012 1.052
29.12.2012 1.006
30.12.2012 847
31.12.2012 695
01.01.2013 572
So you see, the date range is correct 2012-01-03 - 2013-01-01
In the query i take the date and descendant it to the lowest level (day) and then generate a date range. First date of range - 364 days and the last date of range -364 days to get the correct date range. Unfortunately i doesn't works in the cube calculation:
// ------------------------------------------------------------------------
//
// Comparison Week Day - Date.Calendar
//
// ------------------------------------------------------------------------
SCOPE (
[Date].[Year - Quarter - Month - Date].MEMBERS,
[Date].[Date].MEMBERS );
///////////////////////////////////////////////////////////////////////////////////////
( [Date Calculations Week Day].[ComparisonWD].[Previous Year],
[Date Calculations Week Day].[AggregationWD].Members )
= SUM( [Date Calculations Week Day].[ComparisonWD].DefaultMember,
{ParallelPeriod([Date].[Year - Quarter - Month - Date].[Date], 364, Descendants( [Date].[Year - Quarter - Month - Date].CurrentMember , [Date].[Date]).item(0)) :
Parallelperiod ([Date].[Year - Quarter - Month - Date].[Date], 364, Descendants( [Date].[Year - Quarter - Month - Date].CurrentMember , [Date].[Date]).item((Descendants( [Date].[Year - Quarter - Month - Date].CurrentMember , [Date].[Date])).Count - 1))} );
END SCOPE;