DAX Formula for LY MTD(using TOTALMTD and CALCULATE)

[prasy]

DAX  behavior for each formula is different.

I want to calculate Last Year MTD , By default without any slicer selection the function should take Today's date(Last Year) as end of date and calculate sum. If users choose any selection it should take that date as End of date(Last Year)

1. LYMTD = TOTALMTD(SUM([Amount]),SAMEPERIODLASTYEAR(DATESMTD([BDate])))
2. Previous Year MTD Total = CALCULATE([mTD Total],SAMEPERIODLASTYEAR([BDate])) 
3. mTD Total = CALCULATE(sum([Amount]),DATESMTD([BDate]))
4. PY MTDSALES = CALCULATE(SUM([Amount]), DATEADD(DATESMTD([BDate]),-1,YEAR))
5. CACL PY MTD = CALCULATE(SUM([Amount]), DATESBETWEEN([BDate],  [FIRST DAY OF PRESENTMONTH LAST YEAR],  [Last DAY of PRESENTMONTH  Last Year] )) 
6.  FIRST DAY OF PRESENTMONTH LAST YEAR = EDATE(FIRSTDATE(DATESMTD([BDate])),-12)
7. Last DAY of PRESENTMONTH Last Year = EDATE(TODAY(),-12)

• First Screen Shot is without any selections on slicer 
• Second Screen shot with the 1st  date selected -  Previous Year MTD Total  is showing up correct
• Third Screen shot with 2nd  date selection – LYMTD and PY MTDSALES are showing correct calculated value(taking dates from Oct 1st to Oct 3rd of last year as 4th was not working day) , but Previous Year MTD Total  is blank because Last year Oct 4th was not a working day

Fourth Screen shot with 3rd Date selection – LYMTD and Previous Year MTD Total  are showing up correct with calculation from Oct 1st to Oct 3rd 2015  and PY MTDSALES is totally wrong/incorrect

[mohamed901]

I have 3 columns "Month" & "Achievement" & "Location" that I need to create 1 calculated column to get "Average Number" from "Achievement" column using all location but in every month separated 

The average should be like the table below but I can't get the number with DAX.

Kindly any advice 

Month	Achievement	Location	Average
1/1/2017	80	101	85
1/1/2017	90	102	85
2/1/2017	20	103	40
2/1/2017	60	105	40