Grouped by week - determine change

[emildeak]

Hi,

i have a problem where i stuck since several days, maybe you can help me.

I have a table with 2 columns, day and value. I'd like to get the value grouped bei a week Starting on Monday.

And i would like to determine the change of the weekly value compared to the previous week.

Week	Day	Value	Week Avg	Weekly Change
1	Day 1	16%
1	Day 2	7%
1	Day 3	36%
1	Day 4	11%
1	Day 5	13%
1	Day 6	14%
1	Day 7	24%	17%	/
2	Day 8	15%
2	Day 9	41%
2	Day 10	29%
2	Day 11	45%
2	Day 12	43%
2	Day 13	22%
2	Day 14	18%	30%	76%

Thank you in advance, i hope this is possible and there is a way to do this 🙂

best regards

Emil

[v-jianboli-msft · Accepted solution]

Hi @emildeak ,

Based on your description, I have created a simple sample:

Please try:

Week Avg = 
var _a = WEEKDAY(MAX('Table'[Day]),2)
var _b = CALCULATE(AVERAGE('Table'[Value]),FILTER(ALL('Table'),WEEKNUM([Day],2)=WEEKNUM(MAX('Table'[Day]),2)))
return IF(_a=7,_b)

Weekly Change = 
var _a = WEEKDAY(MAX('Table'[Day]),2)
var _b = CALCULATE(SUM('Table'[Value]),FILTER(ALL('Table'),WEEKNUM([Day],2)=WEEKNUM(MAX('Table'[Day]),2)))// the value of current week
var _c = CALCULATE(SUM('Table'[Value]),FILTER(ALL('Table'),WEEKNUM([Day],2)=WEEKNUM(MAX('Table'[Day]),2)-1))// the value of previous week
var _d = DIVIDE(_c,_b)
return IF(_a=7,_d)

Output:

Since I'm not sure what your weekly change is based on, I calculated the percentage change in their total weekly value. You can change the aggregation in the measure to get the value you want, or clarify your calculation logic to me.

Best Regards,

Jianbo Li

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[amitchandak]

@emildeak , one of the ways is to have week rank on the year week column, in separate week/date table

new column

Week Rank RANKX(all('Date'),'Date'[Year Week],,ASC,Dense) //YYYYWW format

This Week = CALCULATE(Average('Table'[Value]), FILTER(ALL('Date'),'Date'[Week Rank]=max('Date'[Week Rank])))
Last Week = CALCULATE(Average('Table'[Value]), FILTER(ALL('Date'),'Date'[Week Rank]=max('Date'[Week Rank])-1))