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

[v-yaningy-msft · 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.
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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 @v-yaningy-msft ,

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