Calculate variance from previous date

[gr84]

Hi,

how is possible to calculate in another column the variance of count from previus date?

My purpose is in case of variace positive start an alert by a query with power automate.

Thanks

[Anonymous · Accepted solution]

Hi, @gr84 

Based on your description, If you have a date column, you can create following new columns to achieve the effect you are looking for. Following picture shows the effect of the display.

New columns:

Previous Count =

CALCULATE (

    MAX ( 'Table'[Value] ),

    FILTER ( 'Table', 'Table'[Date] = EARLIER ( 'Table'[Date] ) - 1 )

)

Variance =

IF (

    'Table'[Date] = MIN ( 'Table'[Date] ),

    BLANK (),

    'Table'[Value] - 'Table'[Previous Count]

)

If this does not work, could you please share some sample data without sensitive information and expected output.
How to provide sample data in the Power BI Forum - Microsoft Fabric Community

Best Regards,
Yang
Community Support Team

If there is any post helps, then please consider Accept it as the solution  to help the other members find it more quickly.
If I misunderstand your needs or you still have problems on it, please feel free to let us know. Thanks a lot!

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[gr84]

Hi @Anonymous ,

thank you, I've insert your solution in my matrix table but my column "count" is calculate then I haven't the column "count" in my table.
How Can I do?

Thanks in advance

[gr84]

Hi,

last update, if I insert new column "previus count" i don't receive expected output.

Previous Count =

CALCULATE (

    MAX ( TLC[Count] ),

    FILTER ( 'TLC', TLC[Time_Issue_agg] = EARLIER ( TLC[Time_Issue_agg] ) - 1 )

)

[Daniel29195]

Hello @gr84

use this measure : 

measure = 

var current_date = max(tbl_name[date_col_table])

var prev_date =  current_date - 1 

current_value = sum(tbl_name[count])

prev_date_value =  calculate ( sum(tbl_name[count]) , tbl_name[date_col_table] = prev_date  ) 

var variance =  current_value  - prev_date_value 

return variance

If my answer helped sort things out for you, i would appreciate a thumbs up 👍 and mark it as the solution ✅!
It makes a difference and might help someone else too. Thanks for spreading the good vibes! 🤠

[gr84]

Hi @Daniel29195 ,

i've tested your solution and i don't receive expected output.

Thanks